I have installed ubuntu 16.04 on my iMac (mid 2011 model) and everything seems to work fine, until (randomly) the unity desktop completely freezes.
I can still move the mouse but the clicks doesn't get any response and I can't use Ctrl+Alt+Fn Key to show any tty. I can still login to the machine through ssh where I can run sudo systemctl restart lightdm.service to bring back the desktop (losing all my work).
I have looked in /var/log/syslog, /var/log/Xorg.0.log and dmesg for any error related to the problem (video card messages, unity messages, etc) but I have not found anything relevant.
I also tried to upgrade to 16.10 (but I prefer to stuck with LTS release if there is a solution) and the problem persits.
Does anybody had similar issue or has any clues of where to look to get more info of the problem?
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