Comment 21 for bug 973951

I uninstalled everything related to mysql-server. Then, uninstalled apparmor. Reinstalled mysql-server via: apt-get install mysql-server and it worked! rebooted and it was still working.

tried to reinstall apparmor and got the following:

Setting up apparmor (2.7.102-0ubuntu3) ...
 * Starting AppArmor profiles Skipping profile in /etc/apparmor.d/disable: usr.sbin.rsyslogd
AppArmor parser error for /etc/apparmor.d/usr.sbin.mysqld in /etc/apparmor.d/tunables/global at line 17: Could not open 'tunables/proc'
AppArmor parser error for /etc/apparmor.d/sbin.dhclient in /etc/apparmor.d/tunables/global at line 17: Could not open 'tunables/proc'
AppArmor parser error for /etc/apparmor.d/usr.sbin.tcpdump in /etc/apparmor.d/tunables/global at line 17: Could not open 'tunables/proc'
                                                                                                                                                         [fail]
invoke-rc.d: initscript apparmor, action "start" failed.
 * Reloading AppArmor profiles Skipping profile in /etc/apparmor.d/disable: usr.sbin.rsyslogd
AppArmor parser error for /etc/apparmor.d/sbin.dhclient in /etc/apparmor.d/tunables/global at line 17: Could not open 'tunables/proc'
AppArmor parser error for /etc/apparmor.d/usr.sbin.mysqld in /etc/apparmor.d/tunables/global at line 17: Could not open 'tunables/proc'
AppArmor parser error for /etc/apparmor.d/usr.sbin.tcpdump in /etc/apparmor.d/tunables/global at line 17: Could not open 'tunables/proc'
invoke-rc.d: initscript apparmor, action "reload" failed.