MySQL Daemon Lock issue

Question

Last night, my MySQL server went down unexpectedly. On attempting to restart (with service mysql restart - I\'m root) it merely hangs. With the mysql -u r

Answer 1

I experienced the same issue today on my Ubuntu server. But I think the solution is NOT to disable locking. In my case, a look at the system log (dmesg | tail and journalctl -xe) revealed that it's an apparmor issue and the solution can be found in this question.