Comment 9 for bug 987715

Almost the same here. I first upgraded guest from 11.10 to 12.04. That was fine. When I upgraded the host as well, the guest crashes before I can really see anything in the console (it does become black for a short moment, bu then it's gone).

Comparing this particular guest with my other VMs showed "vmvga" to be the cause. After setting the video to cirrus, the guest starts again. (All machines are 64bit.)