As a followup, adding the following lines to the mysql apparmour file fixed the problem:
/run/mysqld/mysqld.pid w, /run/mysqld/mysqld.sock w, -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/880339 Title: AppArmor profile needs update To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mysql-5.5/+bug/880339/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
