By ppepote1

1 .- Go to KMENU of Kde or Gnome APPLICATIONS.

2 .- EDITORS.

In this Kde in UTILITIES and then EDITORS.
In this Gnome Apply, and then EDITORS.

3 .- Click on any of them: Gedit, Kate, kwrite, Openoffice, kedit ...

4 .- Once you open the text editor,

5 .- ARCHIVES.

6 .- OPEN.

7 .- ETC

8 .- APT

9 .- sources.list

These records include the url from where Ubuntu download all applications. View an example of that file:

http://ppepote1.blogspot.com/2008/07/etcaptsourceslist-ubuntu-hardy.html

Greetings.