I am running Ubuntu 10.10 since I thought the upgrade was safely possible on my working machine (programmer here). I recently got a freeze now and then, but slowly it got really annoying, when it went from once in a while to once a day. So I googled around for potential causes and re-installed the graphic driver (ATI Radeon HD 4300).
After this, I suddenly only have one core left - there should be 4, since I have an i5!
When I run Ubuntu from a live-CD everything is fine - so it is not a hardware problem...
Any ideas, what I can do without re-installing?
model name: Intel(R) Core(TM) i5 CPU 750 @ 2.67GHz