Comment 1 for bug 758150

So I resolved it by myself by reinstalling and using ext4 as / partition (before that I had btrfs / partition and ext4 /boot small partition).

Looks stable but I have disabled all updates except security updates, just for sure and I'll enable them after stable version of ubuntu comes.

Btw, at least information to which package should I report this problem in future would be useful.

Thank you