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54.

Some applications depend on others being installed in order to work properly. If you try to remove an application which is needed by another application, both of them will be removed. You will be asked to confirm that this is what you want to happen before the applications are removed.

55.

If the application that you want to remove is not available in the <application>Ubuntu Software Center</application>, use Synaptic (<menuchoice><guimenu>System</guimenu><guimenuitem>Administration</guimenuitem><guimenuitem>Synaptic Package Manager</guimenuitem></menuchoice>) to remove it instead.

62.

deb http://archive.ubuntu.com/ubuntu/ maverick main

75.

deb http://ppa.launchpad.net/<emphasis>user</emphasis>/ppa/<emphasis>ppa-name</emphasis> maverick main

76.

As a security measure, all PPAs use a unique GPG key to digitally sign the packages that they provide. This makes it easy to check that the packages have not been tampered with since Launchpad built them and to be sure that you are downloading from the PPA that you want. 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 PPA overview page on Launchpad. Until you add the PPA's key to your system, you will see warnings that you are downloading from an untrusted source.

77.

The key used to sign a PPA is listed on the PPA overview page. Instructions on how to add the key can be found in <xref linkend="adding-repos"/>.

78.

Additional information about adding a PPA repository can be found on <ulink url="https://help.launchpad.net/Packaging/PPA">Launchpad</ulink>.

82.

Some packages from the <emphasis>main</emphasis> and <emphasis>restricted</emphasis> Ubuntu package repositories can be installed from the Ubuntu installation CD. Simply insert your Ubuntu installation CD and open <menuchoice><guimenu>System</guimenu><guimenuitem>Administration</guimenuitem><guimenuitem>Synaptic Package Manager</guimenuitem></menuchoice>. To list only packages on the Ubuntu installation CD, click on the <guibutton>Origin</guibutton> button in the lower left corner of the Synaptic window. The packages should be listed under the <guimenuitem>Ubuntu 10.10_Maverick_Meerkat</guimenuitem> section.

97.

In some cases, restricted software is the only option. Such cases include software for the playback of certain audio and video formats, some fonts and <ulink type="help" url="ghelp:hardware#jockey">drivers for some graphics cards</ulink>.