Comment 9 for bug 131204

Ubuntu sources.list generator at
 http://www.ubuntu-nl.org/source-o-matic/

With this generator you can create your own custom sources.list from various available sources. It takes only two simple steps.

Then, you have to edit the sources list file manually with an editor (e.g. gedit).

If you don't know what to do with a sources.list file, please read https://help.ubuntu.com/community/Repositories/CommandLine

Sorte ;-P