Comment 4 for bug 727478

So, during the upgrade, mysql does get 'stuck' on:
Setting up mysql-client-5.1 (5.1.54-1ubuntu4) ...
Setting up mysql-server-5.1 (5.1.54-1ubuntu4) ...
Installing new version of config file /etc/init/mysql.conf ...

The upstart job keeps running the pre-start script every 30 seconds, but no change to the profile makes this go away. In fact, the profile should be good enough as is:
$ sudo apparmor_parser -p /etc/apparmor.d/usr.sbin.mysqld |grep network
  network inet stream,
  network inet6 stream,
  network inet dgram,
  network inet6 dgram,
  network tcp,

This seems like a maverick kernel vs natty apparmor userspace issue.