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30.

deb http://ftp.debian.org etch main

31.

Press <guibutton>Add Source</guibutton> and then click <guibutton>Close</guibutton> to save your changes.

32.

You will be notified that the information about available software is out-of-date. Press <guibutton>Reload</guibutton>.

33.

Most software repositories use a GPG key to digitally sign the files they provide, which makes it easy to check that the files have not 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.

34.

Once you have downloaded the GPG key, import the key by selecting the <guilabel>Authentication</guilabel> tab, clicking on <guibutton>Import Key File</guibutton>, and then selecting the GPG key to be imported.

35.

Why are there several different Xubuntu update repositories?

36.

The Update Manager automatically finds software updates for your computer when they are available. It regularly gathers information on potential updates from a number of online update sources.

37.

If you click <menuchoice><guimenu>Applications</guimenu><guisubmenu>System</guisubmenu><guimenuitem>Software Sources</guimenuitem></menuchoice> and select the <guilabel>Updates</guilabel> tab, you will notice that four update sources are available. An explanation for each of these is provided below:

38.

<emphasis role="strong">Important security updates:</emphasis> Updates which fix critical security flaws are made available through this source. It is recommended that all users leave this source enabled (it should be enabled by default).

39.

<emphasis role="strong">Recommended updates:</emphasis> Updates which fix serious software problems (which are not security flaws) are made available through this source. Most users will want to leave this source enabled as common and annoying problems are often fixed with these updates.