I've been trying for months to upgrade my Ubuntu 8.10 to 10.04 and have been told that I cannot because of my ATI Radeon Xpress M200 card. I finally got tired of not being able to get things from the repository, so I did a clean install from a CD. I have a 64-bit laptop. The clean install went fine and 10.04 seems to have no problems with the ATI card.
Why was the upgrade telling me it couldn't do it? I thought I would have to scrap this laptop and get another. In fact, I did buy another one with 10.04 as a backup for when this one finally quit.