Comment 44 for bug 1038055

James, I can also reproduce it most of the time just by booting. It just is not always consistent. After the two "good" reboot runs I did shut down the guest and then start it again which brought things back to failing and this time removing "quiet vt_handoff" does not work either. In this case trying to bring up the unity desktop seems to fail as well. Currently the only consistent option seems to be "nomodeset" which allows have a ligthdm and to switch to text console, but fails to bring up the unity desktop.
Feels like a race in some of the parts involved.