I upgraded it to Ubuntu Hardy (8.04) a few months ago. These are my experiences, and a summary of what didn’t work under 7.10, but does under 8.04. Read more here

I used the standard System – Administration – Update Manager to do the upgrade. I chugged away, downloaded the new 8.04 packages and started upgrading. During the upgrade, I allowed the updater to replace my hand-modified /etc/modprobe.d/alsa-base sound config file, since I figured that the improved version with 8.04 would be better than mine (read on … it was a good choice).