Looks like the problem is caused by nvidia drivers:
http://ubuntuforums.org/showthread.php?t=1084959 http://ubuntuforums.org/showthread.php?p=6833346
Looks like the problem is caused by nvidia drivers:
http:// ubuntuforums. org/showthread. php?t=1084959 ubuntuforums. org/showthread. php?p=6833346
http://