Just upgraded to Ubuntu Hardy Heron. Again it broke my graphics driver. Envy (now EnvyNG) to the rescue again.
As it was a Dell Vostro 200, there was some problem with IDE modes and such like, causing Ubuntu to fail booting! A change in the boot settings helped. See this bug report (https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.22/+bug/153702)
So, I have been through Edgy, Feisty, Gutsy, and now Heron. Just a thought, what happens after Ubuntu Zesty Zebra ? ;)