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55.
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If the application that you want to uninstall is not available in Add/Remove Applications, use Synaptic (<menuchoice><guimenu>System</guimenu><guimenuitem>Administration</guimenuitem><guimenuitem>Synaptic Package Manager</guimenuitem></menuchoice>) to remove it instead.
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(no translation yet)
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57.
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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 the package manager's list of available repositories.
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:206(para)
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58.
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Only add software repositories from sources that you trust. Third-party software repositories are not checked for security by Ubuntu members, so could contain software which is harmful to your computer.
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(no translation yet)
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59.
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Open <menuchoice><guimenu>System</guimenu><guimenuitem>Administration</guimenuitem><guimenuitem>Software Sources</guimenuitem></menuchoice> and select <guilabel>Third Party Software</guilabel>.
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(no translation yet)
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61.
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Enter the APT line for the extra repository. This should be available from the website of the repository, 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:228(para)
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63.
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Click <guibutton>Add Source</guibutton> and then click <guibutton>Close</guibutton> to save your changes.
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:234(para)
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64.
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You will be notified that the information about available software is out-of-date. Click <guibutton>Reload</guibutton>.
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:238(para)
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65.
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Packages from the new repository should now be available in your package manager.
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:242(para)
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66.
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As a security measure, most software repositories use a GPG key to digitally sign the files they provide. This makes it easy to check that the files have not been tampered with since their creation. In order for your package manager 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:246(para)
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67.
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Download the GPG key. Then, click <menuchoice><guimenu>System</guimenu><guimenuitem>Administration</guimenuitem><guimenuitem>Software Sources</guimenuitem></menuchoice>, select the <guilabel>Authentication</guilabel> tab, click <guibutton>Import Key File</guibutton> and select 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:254(para)
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