Tips4Linux.com

Do you still have an Ubuntu 7.10 laying around somewhere on a harddrive? You don’t want’to wipe it off and install a fresh Jaunty? or maybe you don’t have a CD-ROM drive and want to upgrade step by step, from version to version.
Since 7.10 is obsolete, the old repositories in /etc/apt/sources.list won’t work. Replace each instance of

deb http://archive.ubuntu.com/ubuntu/ gutsy multiverse

with

deb http://old-releases.ubuntu.com/ubuntu/ gutsy multiverse

Then fire away a

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

to upgrade to 8.04.