/etc/init/apparmor.override is in ubuntu-touch-session 0.108+16.04.20160407-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | # Normally, the apparmor job waits for rc-sysinit to start, but since
# lightdm gets an override to no longer wait on the runlevel event, we
# have to override the apparmor job also.
#
# Waiting for lightdm should be safe on touch images since we don't have
# any daemons that get started with sysv init scripts
start on starting lightdm
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