After upgrading to the new Kubuntu version: Lucid Lynx, the graphics drivers on my computer stopped functioning. Any attempt to reïnstall them failed because they seemed to be already intstalled. After a quick search, more people seem to be affected by this. The only work-around I found resulted in working open source drivers (for ATI: fglrx), but not in working commercial drivers. Though, after an hour of trial and error problem solving I seem to have everything working again. Here’s a short guide for people who didn’t find the solution yet.