I can install any ubuntu version up to 11.10 64Bit, but trying to upgrade the system became unstable after grub , the mouse keeps jumping. When I try to install from the disk, the only thing tha I see is a pic of a keyboard and a man, few secondas later just a dash blink. I upgrade others computer with 12.04 32Bit without problem. I have a intel duo core quad 6700 - 4 gig memory - Ti 560 2gig memory and HD Seagate, other WD and DVD RW.
As I have dualboot with Comice OS 4 I could backup all files.
What is wrong with my system?
Thank you DataFlowUSA