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13.
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There are thousands of programs available to install on Xubuntu. These programs are stored in software archives called (<emphasis>repositories</emphasis>) and are made freely available for installation over the Internet. This makes it very easy to install new programs on your system, and it is also very secure, because each program you install is built specially for Xubuntu and checked before it is installed.
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:37(para)
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14.
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To organize the software, Xubuntu repositories are categorized into four groups: <emphasis>Main</emphasis>, <emphasis>Restricted</emphasis>, <emphasis>Universe</emphasis>, and <emphasis>Multiverse</emphasis>. The rationale used to determine which software goes into which category is based on the level of support that software development teams provide for a program and the level of compliance the program has to the <ulink url="http://www.ubuntu.com/ubuntu/philosophy">Free Software Philosophy</ulink>.
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:38(para)
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20.
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It is possible to add extra repositories, such as those provided by third parties or those for older versions of Xubuntu.
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:49(para)
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21.
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Be careful when installing software from third-party repositories. Software from third-party repositories is not supported by Xubuntu. The software they contain may not have been tested with Xubuntu, and could cause your system to break.
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:51(para)
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22.
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Open <menuchoice><guimenu>Applications</guimenu><guisubmenu>System</guisubmenu><guimenuitem>Software Sources</guimenuitem></menuchoice> and press <guilabel>Third-Party Software</guilabel>.
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:55(para)
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24.
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Enter the <emphasis>APT line</emphasis> for the extra repository. This should be available from the website of the repository or similar, and should look similar to the following:
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:61(para)
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27.
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Most software repositories use a GPG key to digitally sign the files they provide, which makes it easy to check that the files haven't been tampered with since their creation. In order for apt to be able to check this, you need the public key that corresponds to the signatures. The key should be available for download on the repository's website.
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:66(para)
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28.
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Once you have downloaded the GPG key, import the key by selecting the Authenticate tab, and clicking on <emphasis>Import Key File...</emphasis>, and then selecting the GPG key to be imported.
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:68(para)
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29.
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Click <guibutton>Reload</guibutton> in the package manager to update the list of available packages.
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:70(para)
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31.
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With the <guimenuitem>Add/Remove…</guimenuitem> item in the <guimenu>Applications</guimenu> menu, you can install programs to do new things with Xubuntu. You can also remove programs you don't want. You need administrative access to use <application>Add/Remove Programs</application> (see <link linkend="root-and-sudo">Administrative Tasks</link> for more details).
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:76(para)
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