Ubuntu – Packages for Old Releases

The repositories for older releases that are not supported (like 9.04, 9.10, and 10.10) get moved to an archive server. There are repositories available at http://old-releases.ubuntu.com

The reason for this is that it is now out of support and no longer receiving updates and security patches.

I would urge you to consider a supported distribution. If your computer is too old in terms of memory or processor then you should consider a distribution such as Lubuntu or Xubuntu.

If you want to continue using an outdated release then edit /etc/apt/sources.list and change archive.ubuntu.com to old-releases.ubuntu.com

then update with

sudo apt-get update && sudo apt-get dist-upgrade

See also:

· https://help.ubuntu.com/community/EOLUpgrades/

Taken From: http://askubuntu.com/questions/91815/how-to-install-software-or-upgrade-from-old-unsupported-release