Comment 8 for bug 1177086

I also had this bug. I tried a few things and what worked was to boot at first with acpi=off and nomodeset. Then I rebooted but this time only with acpi=off. Unity was REALLY slow because I had no 3d acceleration. Then I rebooted with no options and everything was OK (nouveau driver in use). When I managed to boot for the first time (and the second) I couldn't connect with my wireless so I switched my dlink usb receiver with a cisco one. I m just telling you this because I don't know if switching the dongles had anything to do with it (power management or something). Everything else failed for me at the beginning. Hope this helps out someone...