apt-get update for ubuntu 10.04

To complement techraf's answer, if you want to use old releases, you can access them using this address:

http://old-releases.ubuntu.com

To enable this, open the /etc/apt/sources.list file with a text editor, and wherever you see archive.ubuntu.com (the source of releases actively supported), change it to old-releases.ubuntu.com (you can use the find & replace option to speed it up).

It's really trivial to verify, just browse to http://il.archive.ubuntu.com/ubuntu/dists/ (you can also drop theil from the front) and check the results.

The site is responding, you get a connection, but there is no lucid among the directories corresponding to Ubuntu releases.

Conclusion: the packages were removed.