This is fixed in AppArmor bzr since
revno: 3437.1.4 timestamp: Wed 2016-04-13 09:24:46 -0400 usr.sbin.smbd: new lock dir used by recent versions (4.3.8)
so you'll "just" need to backport the smbd profile to 16.04.
This is fixed in AppArmor bzr since
revno: 3437.1.4
timestamp: Wed 2016-04-13 09:24:46 -0400
usr.sbin.smbd: new lock dir used by recent versions (4.3.8)
so you'll "just" need to backport the smbd profile to 16.04.