Excellent !!!
Worked for me too....
Just for note who want to update the Apparmor profile and get it work.
Modify the file "/etc/apparmor.d/usr.sbin.named", so that files7directories should have flags as follows (you might need to add few more based on your installation):
/etc/bind/** r,
/var/lib/bind/** rw,
/var/lib/bind/ rw,
/var/cache/bind/** rw,
/var/cache/bind/ rw,
/etc/ldap.conf r,
/var/run/named/ rw,
/var/run/named/** rw,
/usr/sbin/ r,
/usr/sbin/** r,
/etc/ldap/ r,
/etc/ldap/** r,
/usr/sbin/ r,
/usr/sbin/** r,
/run/named/ r,
/run/named/** r,
Best of luck.