Comment 24 for bug 986892

You do not need the originally affected system to verify this fix. There is a "test case" listed in the bug description which does not require a previously affected system, but does require one which you can upgrade to precise (A bare VM is useful here)

MySQL 5.1 and MySQL 5.5 (oneiric, precise, lucid)
1. install mysql-server
2. check /var/lib/dpkg/info/mysql-server-5.1.postrm for conditional logic (change 5.1 to 5.5 for precise)
3. for oneiric and lucid, upgrade to Ubuntu 12.04, verify that /etc/apparmor.d/local/usr.sbin.mysqld is still present.