I was on ubuntu 11.10, I have tried to update the OS to 12.04 (with 12.04.1 version). All has worked, except the fact that when I reboot :
- I stay blocked on the loading page
- I can access the consol mode (ctrl-alt-F1) If I try to restart the graphic interface, it freezes completely, but it appears (no more keyboard, no mouse)
Thank you for your help!