This bug could be related to this Unity bug [Intel GMA500] Visual glitches and crash (Maverick and Natty)
https://bugs.launchpad.net/ubuntu/+source/unity/+bug/669417
This bug could be related to this Unity bug
[Intel GMA500] Visual glitches and crash (Maverick and Natty)
https:/ /bugs.launchpad .net/ubuntu/ +source/ unity/+ bug/669417