Remove AppArmor on Ubuntu Server 14.04

First of all, stop the apparmor:

sudo /etc/init.d/apparmor stop

Next thing to do is to disable this service from starting at boot time:

sudo update-rc.d -f apparmor remove

And at last, remove and cleanup:

sudo apt-get --purge remove apparmor apparmor-utils libapparmor-perl libapparmor1

Done!