One benefit of shooting my mouth off on a blog is that, when I'm wrong, people tell me. In this case, I owe a
big apology to the Ubuntu Project. A
few weeks ago I complained that they had killed off the repositories for old versions of Ubuntu, including 7.10 "Gutsy Gibbon" which I have installed on one PC. Well, I was wrong. My thanks to Howard F. and Dick M. for pointing out to me that old versions of Ubuntu Linux, and old repositories, are still available at http://old-releases.ubuntu.com/
To point an older Ubuntu system to the archived repository, open a terminal window and type the command
sudo nano /etc/apt/sources.list
to edit the file /etc/apt/sources.list with the "nano" text editor, as superuser. In that file, in each "deb" and "deb-src" line, change
archive.ubuntu.com to
old-releases.ubuntu.com. (You might be using a different repository; the important thing is that the repository for the deb commands must now be http://old-releases.ubuntu.com/ubuntu/.) Then save, exit the editor, and type the command
sudo apt-get update
to reload all the package lists. After doing this, the usual Synaptic package manager or "Add/Remove Programs" menu function should work correctly.
This change is also described on the
Ubuntu Forums.