This bug has been closed for 3 years so current issues ideally shouldn't be discussed here.
If you're using Nvidia then please see bug 2059847. If that's not the issue then please run this command to open a new bug:
ubuntu-bug libmutter-13-0
This bug has been closed for 3 years so current issues ideally shouldn't be discussed here.
If you're using Nvidia then please see bug 2059847. If that's not the issue then please run this command to open a new bug:
ubuntu-bug libmutter-13-0