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<!-- $Id$ -->
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<sect1 id="boot-troubleshooting">
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<title>Troubleshooting the Installation Process</title>
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<para>
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</para>
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<sect2 arch="not-s390" id="unreliable-cd">
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<title>CD-ROM Reliability</title>
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<para>
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Sometimes, especially with older CD-ROM drives, the installer may fail
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to boot from a CD-ROM. The installer may also — even after booting
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successfully from CD-ROM — fail to recognize the CD-ROM or return
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errors while reading from it during the installation.
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</para><para>
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There are a many different possible causes for these problems. We can
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only list some common issues and provide general suggestions on how to
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deal with them. The rest is up to you.
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</para><para>
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There are two very simple things that you should try first.
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<itemizedlist>
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<listitem><para>
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If the CD-ROM does not boot, check that it was inserted correctly and that
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it is not dirty.
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</para></listitem>
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<listitem><para>
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If the installer fails to recognize a CD-ROM, try just running the option
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<menuchoice> <guimenuitem>Detect and mount CD-ROM</guimenuitem> </menuchoice>
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a second time. Some DMA related issues with older CD-ROM drives are known to
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be resolved in this way.
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</para></listitem>
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</itemizedlist>
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</para><para>
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If this does not work, then try the suggestions in the subsections below.
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Most, but not all, suggestions discussed there are valid for both CD-ROM and
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DVD, but we'll use the term CD-ROM for simplicity.
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</para><para>
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If you cannot get the installation working from CD-ROM, try one of the
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other installation methods that are available.
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</para>
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<sect3>
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<title>Common issues</title>
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<itemizedlist>
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<listitem><para>
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Some older CD-ROM drives do not support reading from discs that were burned
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at high speeds using a modern CD writer.
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</para></listitem>
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<listitem><para>
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If your system boots correctly from the CD-ROM, it does not necessarily
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mean that Linux also supports the CD-ROM (or, more correctly, the controller
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that your CD-ROM drive is connected to).
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</para></listitem>
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<listitem><para>
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Some older CD-ROM drives do not work correctly if <quote>direct memory
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access</quote> (DMA) is enabled.
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</para></listitem>
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</itemizedlist>
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</sect3>
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<sect3>
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<title>How to investigate and maybe solve issues</title>
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<para>
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If the CD-ROM fails to boot, try the suggestions listed below.
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<itemizedlist>
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<listitem><para>
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Check that your BIOS actually supports booting from CD-ROM (older systems
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possibly don't) and that your CD-ROM drive supports the media you are using.
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</para></listitem>
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<listitem><para>
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If you downloaded an iso image, check that the md5sum of that image matches
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the one listed for the image in the <filename>MD5SUMS</filename> file that
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should be present in the same location as where you downloaded the image
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from.
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<informalexample><screen>
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$ md5sum <replaceable>debian-testing-i386-netinst.iso</replaceable>
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a20391b12f7ff22ef705cee4059c6b92 <replaceable>debian-testing-i386-netinst.iso</replaceable>
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</screen></informalexample>
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Next, check that the md5sum of the burned CD-ROM matches as well. The
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following command should work. It uses the size of the image to read the
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correct number of bytes from the CD-ROM.
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<informalexample><screen>
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$ dd if=/dev/cdrom | \
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> head -c `stat --format=%s <replaceable>debian-testing-i386-netinst.iso</replaceable>` | \
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> md5sum
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a20391b12f7ff22ef705cee4059c6b92 -
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262668+0 records in
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262668+0 records out
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134486016 bytes (134 MB) copied, 97.474 seconds, 1.4 MB/s
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</screen></informalexample>
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</para></listitem>
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</itemizedlist>
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</para><para>
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If, after the installer has been booted successfully, the CD-ROM is not
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detected, sometimes simply trying again may solve the problem. If you have
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more than one CD-ROM drive, try changing the CD-ROM to the other drive.
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If that does not work or if the CD-ROM is recognized but there are errors
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when reading from it, try the suggestions listed below. Some basic knowledge
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of Linux is required for this.
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To execute any of the commands, you should first switch to the second
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virtual console (VT2) and activate the shell there.
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<itemizedlist>
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<listitem><para>
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Switch to VT4 or view the contents of <filename>/var/log/syslog</filename>
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(use <command>nano</command> as editor) to check for any specific error
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messages. After that, also check the output of <command>dmesg</command>.
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</para></listitem>
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<listitem><para>
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Check in the output of <command>dmesg</command> if your CD-ROM drive was
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recognized. You should see something like (the lines do not necessarily
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have to be consecutive):
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<informalexample><screen>
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Probing IDE interface ide1...
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hdc: TOSHIBA DVD-ROM SD-R6112, ATAPI CD/DVD-ROM drive
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ide1 at 0x170-0x177,0x376 on irq 15
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hdc: ATAPI 24X DVD-ROM DVD-R CD-R/RW drive, 2048kB Cache, UDMA(33)
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Uniform CD-ROM driver Revision: 3.20
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</screen></informalexample>
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If you don't see something like that, chances are the controller your CD-ROM
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is connected to was not recognized or may be not supported at all. If you
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know what driver is needed for the controller, you can try loading it manually
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using <command>modprobe</command>.
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</para></listitem>
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<listitem><para>
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Check that there is a device node for your CD-ROM drive under
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<filename>/dev/</filename>. In the example above, this would be
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<filename>/dev/hdc</filename>.
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There should also be a <filename>/dev/cdroms/cdrom0</filename>.
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</para></listitem>
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<listitem><para>
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Use the <command>mount</command> command to check if the CD-ROM is already
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mounted; if not, try mounting it manually:
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<informalexample><screen>
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$ mount /dev/<replaceable>hdc</replaceable> /cdrom
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</screen></informalexample>
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Check if there are any error messages after that command.
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</para></listitem>
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<listitem><para>
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Check if DMA is currently enabled:
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<informalexample><screen>
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$ cd /proc/<replaceable>ide</replaceable>/<replaceable>hdc</replaceable>
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$ grep using_dma settings
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using_dma 1 0 1 rw
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</screen></informalexample>
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A <quote>1</quote> in the first column after <literal>using_dma</literal>
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means it is enabled. If it is, try disabling it:
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<informalexample><screen>
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$ echo -n "using_dma:0" >settings
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</screen></informalexample>
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Make sure that you are in the directory for the device that corresponds
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to your CD-ROM drive.
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</para></listitem>
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<listitem><para>
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If there are any problems during the installation, try checking the integrity
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of the CD-ROM using the option near the bottom of the installer's main menu.
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This option can also be used as a general test if the CD-ROM can be read
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reliably.
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</para></listitem>
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</itemizedlist>
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</para>
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</sect3>
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</sect2>
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<sect2 condition="supports-floppy-boot" id="unreliable-floppies">
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<title>Floppy Disk Reliability</title>
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<para>
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The biggest problem for people using floppy disks to install Debian
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seems to be floppy disk reliability.
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</para><para>
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The boot floppy is the floppy with the worst problems, because it
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is read by the hardware directly, before Linux boots. Often, the
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hardware doesn't read as reliably as the Linux floppy disk driver, and
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may just stop without printing an error message if it reads incorrect
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data. There can also be failures in the driver floppies, most of which
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indicate themselves with a flood of messages about disk I/O errors.
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</para><para>
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If you are having the installation stall at a particular floppy, the first
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thing you should do is write the image to a <emphasis>different</emphasis>
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floppy and see if that solves the problem. Simply reformatting the old
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floppy may not be sufficient, even if it appears that the floppy was
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reformatted and written with no errors. It is sometimes useful to try
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writing the floppy on a different system.
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</para><para>
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One user reports he had to write the images to floppy
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<emphasis>three</emphasis> times before one worked, and then
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everything was fine with the third floppy.
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</para><para>
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Normally you should not have to download a floppy image again, but if you
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are experiencing problems it is always useful to verify that the images
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were downloaded correctly by verifying their md5sums.
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</para><para>
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Other users have reported that simply rebooting a few times with the
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same floppy in the floppy drive can lead to a successful boot. This is
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all due to buggy hardware or firmware floppy drivers.
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</para>
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</sect2>
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<sect2><title>Boot Configuration</title>
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<para>
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If you have problems and the kernel hangs during the boot process,
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doesn't recognize peripherals you actually have, or drives are not
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recognized properly, the first thing to check is the boot parameters,
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as discussed in <xref linkend="boot-parms"/>.
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</para><para>
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Often, problems can be solved by removing add-ons and peripherals, and
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then trying booting again. <phrase arch="x86">Internal modems, sound
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cards, and Plug-n-Play devices can be especially problematic.</phrase>
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</para><para>
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If you have a large amount of memory installed in your machine, more
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than 512M, and the installer hangs when booting the kernel, you may
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need to include a boot argument to limit the amount of memory the
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kernel sees, such as <userinput>mem=512m</userinput>.
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</para>
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</sect2>
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<sect2 arch="x86" id="i386-boot-problems">
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<title>Common &arch-title; Installation Problems</title>
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<para>
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There are some common installation problems that can be solved or avoided by
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passing certain boot parameters to the installer.
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</para><para>
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Some systems have floppies with <quote>inverted DCLs</quote>. If you receive
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errors reading from the floppy, even when you know the floppy is good,
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try the parameter <userinput>floppy=thinkpad</userinput>.
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</para><para>
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On some systems, such as the IBM PS/1 or ValuePoint (which have ST-506
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disk drivers), the IDE drive may not be properly recognized. Again,
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try it first without the parameters and see if the IDE drive is
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recognized properly. If not, determine your drive geometry
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(cylinders, heads, and sectors), and use the parameter
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<userinput>hd=<replaceable>cylinders</replaceable>,<replaceable>heads</replaceable>,<replaceable>sectors</replaceable></userinput>.
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</para><para>
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If you have a very old machine, and the kernel hangs after saying
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<computeroutput>Checking 'hlt' instruction...</computeroutput>, then
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you should try the <userinput>no-hlt</userinput> boot argument, which
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disables this test.
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</para><para>
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If your screen begins to show a weird picture while the kernel boots,
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eg. pure white, pure black or colored pixel garbage, your system may
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contain a problematic video card which does not switch to the
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framebuffer mode properly. Then you can use the boot parameter
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<userinput>fb=false video=vga16:off</userinput> to disable the framebuffer
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console. Only a reduced set of
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languages will be available during the installation due to limited
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console features. See <xref linkend="boot-parms"/> for details.
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</para>
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<sect3>
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<title>System Freeze During the PCMCIA Configuration Phase</title>
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<para>
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Some laptop models produced by Dell are known to crash when PCMCIA device
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detection tries to access some hardware addresses. Other laptops may display
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similar problems. If you experience such a problem and you don't need PCMCIA
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support during the installation, you can disable PCMCIA using the
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<userinput>hw-detect/start_pcmcia=false</userinput> boot parameter. You can
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then configure PCMCIA after the installation is completed and exclude the
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resource range causing the problems.
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</para><para>
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Alternatively, you can boot the installer in expert mode. You will
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then be asked to enter the resource range options your hardware
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needs. For example, if you have one of the Dell laptops mentioned
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above, you should enter <userinput>exclude port
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0x800-0x8ff</userinput> here. There is also a list of some common
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resource range options in the <ulink
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url="http://pcmcia-cs.sourceforge.net/ftp/doc/PCMCIA-HOWTO-1.html#ss1.12">System
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resource settings section of the PCMCIA HOWTO</ulink>. Note that you
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have to omit the commas, if any, when you enter this value in the
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installer.
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</para>
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</sect3>
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<sect3>
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<title>System Freeze while Loading USB Modules</title>
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<para>
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The kernel normally tries to install USB modules and the USB keyboard driver
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in order to support some non-standard USB keyboards. However, there are some
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broken USB systems where the driver hangs on loading. A possible workaround
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may be disabling the USB controller in your mainboard BIOS setup. Another option
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is passing the <userinput>nousb</userinput> parameter at the boot prompt.
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</para>
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</sect3>
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</sect2>
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<sect2 arch="sparc" id="sparc-boot-problems">
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<title>Common &arch-title; Installation Problems</title>
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<para>
|
| 380 |
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There are some common installation problems that are worth mentioning.
|
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</para>
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<sect3>
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<title>Misdirected video output</title>
|
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<para>
|
| 387 |
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It is fairly common for &arch-title; to have two video cards in one machine,
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for example an ATI card and a Sun Creator 3D. In some cases, this may result
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in the video output getting misdirected soon after the system boots. In
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typical cases, the display will only show:
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<informalexample><screen>
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| 394 |
Remapping the kernel... done
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Booting Linux...
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</screen></informalexample>
|
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To work around this, you can either pull out one of the video cards, or
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disable the one not used during the OpenProm boot phase using a kernel
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parameter. For example, to disable an ATI card, you should boot the
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installer with <userinput>video=atyfb:off</userinput>.
|
| 402 |
|
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</para><para>
|
| 404 |
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Note that you may also have to manually add this parameter to the silo
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configuration (edit <filename>/target/etc/silo.conf</filename> before
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rebooting) and, if you installed X11, modify the video driver in
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<filename>/etc/X11/xorg.conf</filename>.
|
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| 410 |
</para>
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| 411 |
</sect3>
|
| 412 |
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| 413 |
<sect3>
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| 414 |
<title>Failure to Boot or Install from CD-ROM</title>
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| 415 |
<para>
|
| 416 |
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| 417 |
Some Sparc systems are notoriously difficult to boot from CD-ROM and
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even if they do boot, there may be inexplicable failures during the
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installation. Most problems have been reported with SunBlade systems.
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</para><para>
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We recommend to install such systems by netbooting the installer.
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</para>
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</sect3>
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</sect2>
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<sect2 id="kernel-msgs">
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<title>Interpreting the Kernel Startup Messages</title>
|
| 431 |
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| 432 |
<para>
|
| 433 |
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| 434 |
During the boot sequence, you may see many messages in the form
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<computeroutput>can't find <replaceable>something</replaceable></computeroutput>,
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or <computeroutput><replaceable>something</replaceable>
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not present</computeroutput>, <computeroutput>can't initialize
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| 438 |
<replaceable>something</replaceable></computeroutput>,
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or even <computeroutput>this driver release depends
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on <replaceable>something</replaceable></computeroutput>.
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Most of these messages are harmless. You
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see them because the kernel for the installation system is built to
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run on computers with many different peripheral devices. Obviously, no
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one computer will have every possible peripheral device, so the
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operating system may emit a few complaints while it looks for
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peripherals you don't own. You may also see the system pause for a
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while. This happens when it is waiting for a device to respond, and
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| 448 |
that device is not present on your system. If you find the time it
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| 449 |
takes to boot the system unacceptably long, you can create a
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| 450 |
custom kernel later (see <xref linkend="kernel-baking"/>).
|
| 451 |
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| 452 |
</para>
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| 453 |
</sect2>
|
| 454 |
|
| 455 |
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| 456 |
<sect2 id="problem-report">
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<title>Reporting Installation Problems</title>
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| 458 |
<para>
|
| 459 |
|
| 460 |
If you get through the initial boot phase but cannot complete the install,
|
| 461 |
the menu option <guimenuitem>Save debug logs</guimenuitem> may be helpful.
|
| 462 |
It lets you store system error logs and configuration information from the
|
| 463 |
installer to a floppy, or download them using a web browser.
|
| 464 |
|
| 465 |
This information may provide clues as to what went wrong and how to
|
| 466 |
fix it. If you are submitting a bug report, you may want to attach
|
| 467 |
this information to the bug report.
|
| 468 |
|
| 469 |
</para><para>
|
| 470 |
|
| 471 |
Other pertinent installation messages may be found in
|
| 472 |
<filename>/var/log/</filename> during the
|
| 473 |
installation, and <filename>/var/log/installer/</filename>
|
| 474 |
after the computer has been booted into the installed system.
|
| 475 |
|
| 476 |
</para>
|
| 477 |
</sect2>
|
| 478 |
|
| 479 |
<sect2 id="submit-bug">
|
| 480 |
<title>Submitting Installation Reports</title>
|
| 481 |
<para>
|
| 482 |
|
| 483 |
If you still have problems, please submit an installation report. We also
|
| 484 |
encourage installation reports to be sent even if the installation is
|
| 485 |
successful, so that we can get as much information as possible on the largest
|
| 486 |
number of hardware configurations.
|
| 487 |
|
| 488 |
</para><para>
|
| 489 |
|
| 490 |
Note that your installation report will be published in the Debian Bug
|
| 491 |
Tracking System (BTS) and forwarded to a public mailing list. Make sure that
|
| 492 |
you use an e-mail address that you do not mind being made public.
|
| 493 |
|
| 494 |
</para><para>
|
| 495 |
|
| 496 |
If you have a working Debian system, the easiest way to send an installation
|
| 497 |
report is to install the <classname>installation-report</classname> and
|
| 498 |
<classname>reportbug</classname> packages
|
| 499 |
(<command>aptitude install installation-report reportbug</command>),
|
| 500 |
configure <classname>reportbug</classname> as explained in
|
| 501 |
<xref linkend="mail-outgoing"/>, and run the command <command>reportbug
|
| 502 |
installation-reports</command>.
|
| 503 |
|
| 504 |
</para><para>
|
| 505 |
|
| 506 |
Alternatively you can use this template when filling out
|
| 507 |
installation reports, and file the report as a bug report against the
|
| 508 |
<classname>installation-reports</classname> pseudo package, by sending it to
|
| 509 |
<email>submit@bugs.debian.org</email>.
|
| 510 |
|
| 511 |
<informalexample><screen>
|
| 512 |
Package: installation-reports
|
| 513 |
|
| 514 |
Boot method: <How did you boot the installer? CD? floppy? network?>
|
| 515 |
Image version: <Full URL to image you downloaded is best>
|
| 516 |
Date: <Date and time of the install>
|
| 517 |
|
| 518 |
Machine: <Description of machine (eg, IBM Thinkpad R32)>
|
| 519 |
Processor:
|
| 520 |
Memory:
|
| 521 |
Partitions: <df -Tl will do; the raw partition table is preferred>
|
| 522 |
|
| 523 |
Output of lspci -nn and lspci -vnn:
|
| 524 |
|
| 525 |
Base System Installation Checklist:
|
| 526 |
[O] = OK, [E] = Error (please elaborate below), [ ] = didn't try it
|
| 527 |
|
| 528 |
Initial boot: [ ]
|
| 529 |
Detect network card: [ ]
|
| 530 |
Configure network: [ ]
|
| 531 |
Detect CD: [ ]
|
| 532 |
Load installer modules: [ ]
|
| 533 |
Detect hard drives: [ ]
|
| 534 |
Partition hard drives: [ ]
|
| 535 |
Install base system: [ ]
|
| 536 |
Clock/timezone setup: [ ]
|
| 537 |
User/password setup: [ ]
|
| 538 |
Install tasks: [ ]
|
| 539 |
Install boot loader: [ ]
|
| 540 |
Overall install: [ ]
|
| 541 |
|
| 542 |
Comments/Problems:
|
| 543 |
|
| 544 |
<Description of the install, in prose, and any thoughts, comments
|
| 545 |
and ideas you had during the initial install.>
|
| 546 |
</screen></informalexample>
|
| 547 |
|
| 548 |
In the bug report, describe what the problem is, including the last
|
| 549 |
visible kernel messages in the event of a kernel hang. Describe the
|
| 550 |
steps that you did which brought the system into the problem state.
|
| 551 |
|
| 552 |
</para>
|
| 553 |
</sect2>
|
| 554 |
</sect1>
|