On a Precise system, LXC is no longer working:
# lxc-execute -n foo /bin/bash
lxc-execute: Permission denied - failed to change apparmor profile to lxc-container-default
lxc-execute: invalid sequence number 1. expected 2
lxc-execute: failed to spawn 'foo'
At a minimum, I'm guessing lxc-execute needs a profile similar to lxc-start, but trying to run lxc-start failed with the same error.