I have an ubuntu 12.04 LTS guest in VBOX inside my native Windows 7. The graphics suddenly "stop drawing" or something, it stops updating the screen. I have tried adjusting the video memory (from 128mb to 64 mb and back), adjusting the RAM (it has 2048mb, before it was 1024mb) and tried running on the alternate chipset ICH9.
I noticed that inside Ubuntu, in the system settings->details, it says that the graphics driver is unknown, and the experience is standard. The guest additions are installed, but still. Is this normal?
Alternatively, what else can be wrong if this is not the issue?
UPDATE: I have now disabled the 3d acceleration. If someone knows how to solve this, please provide an answer, I will be super happy.