Today I logged into an old Ubuntu machine, and tried to install a program. However, running apt-get update came up with a whole bunch of "404 file not found" errors, although it was using the standard ubuntu repositories.
Turns out some time ago, the Ubuntu project took down the Breezy Badger repositories. After all, this is an old project. Thankfully there is a way you can update your breezy machines even without this repository. According to this thread, just change the lines "archive.ubuntu.com ..." to "old-releases.ubuntu.com ..." in your /etc/apt/sources.list or using the GUI in Synaptic/Adept.
More info here.