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<!-- $Id: $ -->
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<sect3 id="pkgsel">
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<title>Selecting and Installing Software</title>
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<para>
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During the installation process, you are given the opportunity to select
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additional software to install. Rather than picking individual software
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packages from the &num-of-distrib-pkgs; available packages, this stage of
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the installation process focuses on selecting and installing predefined
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collections of software to quickly set up your computer to perform various
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tasks.
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</para><para>
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So, you have the ability to choose <emphasis>tasks</emphasis> first,
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and then add on more individual packages later. These tasks loosely
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represent a number of different jobs or things you want to do with
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your computer, such as <quote>Desktop environment</quote>,
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<quote>Web server</quote>, or <quote>Print server</quote><footnote>
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<para>
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You should know that to present this list, the installer is merely
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invoking the <command>tasksel</command> program. It can be
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run at any time after installation to install (or remove) more
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packages, or you can use a more fine-grained tool such as <command>aptitude</command>.
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If you are looking for a specific single package, after
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installation is complete, simply run <userinput>aptitude install
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<replaceable>package</replaceable></userinput>, where
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<replaceable>package</replaceable> is the name of the package you are
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looking for.
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</para>
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</footnote>. <xref linkend="tasksel-size-list"/> lists the space
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requirements for the available tasks.
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</para><para>
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Once you've selected your tasks, select
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<guibutton>Ok</guibutton>. At this point,
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<command>aptitude</command> will install the packages you've
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selected.
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<note><para>
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In the standard user interface of the installer, you can use the space bar
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to toggle selection of a task.
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</para></note>
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<note><para>
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Note that some tasks may be pre-selected based on the characteristics of the
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computer you are installing. If you disagree with these selections you can
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un-select the tasks. You can even opt to install no tasks at all at this point.
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</para></note>
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</para><para>
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Each package you selected with <command>tasksel</command> is downloaded,
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unpacked and then installed in turn by the <command>apt-get</command> and
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<command>dpkg</command> programs. If a particular program needs more
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information from the user, it will prompt you during this process.
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</para>
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<sect4 id="config-mta">
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<title>Configuring Your Mail Transport Agent</title>
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<para>
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Today, email is a very important part of many people's life, so it's
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no surprise Debian lets you configure your mail system right as a part
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of the installation process. The standard mail transport agent in
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Debian is <command>exim4</command>, which is relatively small,
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flexible, and easy to learn.
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</para><para>
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You may ask if this is needed even if your computer is not connected
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to any network. The short answer is: Yes. The longer explanation: Some
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system utilities (like <command>cron</command>,
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<command>quota</command>, <command>aide</command>, …) may send
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you important notices via email.
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</para><para>
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So on the first screen you will be presented with several common mail
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scenarios. Choose the one that most closely resembles your needs:
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</para>
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<variablelist>
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<varlistentry>
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<term>internet site</term>
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<listitem><para>
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Your system is connected to a network and your mail is sent and
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received directly using SMTP. On the following screens you will be
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asked a few basic questions, like your machine's mail name, or a list of
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domains for which you accept or relay mail.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>mail sent by smarthost</term>
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<listitem><para>
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In this scenario is your outgoing mail forwarded to another machine,
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called a <quote>smarthost</quote>, which does the actual job for
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you. Smarthost also usually stores incoming mail addressed to your
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computer, so you don't need to be permanently online. That also means
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you have to download your mail from the smarthost via programs like
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fetchmail. This option is suitable for dial-up users.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>local delivery only</term>
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<listitem><para>
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Your system is not on a network and mail is sent or received only
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between local users. Even if you don't plan to send any messages, this
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option is highly recommended, because some system utilities may send
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you various alerts from time to time (e.g. beloved <quote>Disk quota
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exceeded</quote>). This option is also convenient for new users,
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because it doesn't ask any further questions.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>no configuration at this time</term>
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<listitem><para>
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Choose this if you are absolutely convinced you know what you are
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doing. This will leave you with an unconfigured mail system —
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until you configure it, you won't be able to send or receive any mail
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and you may miss some important messages from your system utilities.
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</para></listitem>
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</varlistentry>
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</variablelist>
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<para>
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If none of these scenarios suits your needs, or if you need a finer
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setup, you will need to edit configuration files under the
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<filename>/etc/exim4</filename> directory after the installation is
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complete. More information about <command>exim4</command> may be found
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under <filename>/usr/share/doc/exim4</filename>.
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</para>
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</sect4>
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</sect3>
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