Browsing Walloon translation

27.

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.

28.

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.

29.

Click <guibutton>Reload</guibutton> in the package manager to update the list of available packages.

30.

Add/Remove Applications

31.

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).

32.

If you know the name of a program you want to install, enter it in the <guilabel>Search</guilabel> field. Otherwise, begin by choosing a software category on the left.

33.

Programs that are already installed begin with a check mark next to their name. Uncheck a program if you want to remove it from your computer.

34.

When you click <guibutton>Apply</guibutton> or <guibutton>OK</guibutton>, any new software will be downloaded from the Internet, and Xubuntu will make the changes you selected. If you have not activated the online package archive, you may be asked to insert your Xubuntu CD-ROM to install some packages.

35.

Some software cannot be installed or removed using <application>Add/Remove Applications</application>. If you cannot find the package you are looking for, start the advanced package manager <application>Synaptic</application> (see <xref linkend="advanced"/>).

36.

Advanced package management