<page xmlns="http://projectmallard.org/1.0/"
      xmlns:its="http://www.w3.org/2005/11/its"
      type="topic" style="task"
      id="addremove-sources">

  <info>
    <credit type="author">
      <name>Ubuntu Documentation Team</name>
    </credit>
    <desc>
      Add other repositories to extend the software sources Ubuntu uses for 
      installation and upgrades.
    </desc>
    <include href="legal.xml" xmlns="http://www.w3.org/2001/XInclude"/>
    <link type="guide" xref="addremove"/>
    <revision version="13.10" date="2013-10-25" status="review"/>
  </info>

  <title>
    Add additional software repositories
  </title>

  <p>
    Software is available from third-party sources, as well as from the default 
    Ubuntu software repositories. If you want to install software from a 
    third-party software repository, you must add it to Ubuntu's list of 
    available repositories.
  </p>

  <note style="warning">
    <p>
      Only add software repositories from sources that you trust!
    </p>
    <p>
      Third-party software repositories are not checked for security or 
      reliability by Ubuntu members, and may contain software which is harmful 
      to your computer.
    </p>
  </note>

  <steps>
    <title>
      Install other repositories
    </title>
    <item>
      <p>
        Click on the <app>Ubuntu Software Center</app> icon in the Launcher, or 
        search for Ubuntu Software Center in the search bar of the 
        <app>Dash</app>.
      </p>
    </item>
    <item>
      <p>
        When the Software Center launches, click <guiseq><gui>Edit</gui>
        <gui>Software Sources</gui></guiseq>
      </p>
    </item>
    <item>
      <p>
        You will be asked to enter your password. Once you have done that, 
        switch to the <gui>Other Software</gui> tab.
      </p>
    </item>
    <item>
      <p>
        Click <gui>Add</gui> and enter the APT line for the repository. This 
        should be available from the website of the repository, and should look 
        similar to:
      </p>
      <p>
        <code its:translate="no">deb http://archive.ubuntu.com/ubuntu/ trusty main</code>
      </p>
    </item>
    <item>
      <p>
        Click <gui>Add Source</gui> then close the Software Sources window. 
        Ubuntu Software Center will then check your software sources for new 
        updates.
      </p>
    </item>
  </steps>

  <section id="canonical-partner">
    <title>
      Activate the Canonical Partner repository
    </title>
    <p>
      The Canonical Partner repository offers some proprietary applications 
      that don't cost any money to use but are closed source. They include 
      software like <app>Skype</app>, <app>Adobe Reader</app> and <app>Adobe 
      Flash Plugin</app>. Software in this repository will appear in Ubuntu 
      Software Center search results but won't be installable until this 
      repository is enabled.
    </p>
    <p>
      To enable the repository, follow the steps above to open the <gui>Other 
      Software</gui> tab in <app>Software Sources</app>. If you see the 
      <gui>Canonical Partners</gui> repository in the list, make sure it is 
      checked then close the Software Sources window. If you don't see it, click 
      <gui>Add</gui> and enter:
    </p>
    <p>
      <code its:translate="no">deb http://archive.canonical.com/ubuntu trusty partner</code>
    </p>
    <p>
      Click <gui>Add Source</gui> then close the Software Sources window. Wait a 
      moment for Ubuntu Software Center to download the repository information.
    </p>
  </section>

</page>
