/etc/apparmor.d/tunables/ntpd is in ntp 1:4.2.6.p5+dfsg-3ubuntu2.
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 8 9 10 11 12 13 14 15 | # vim:syntax=apparmor
# ------------------------------------------------------------------
#
# Copyright (C) 2002-2005 Novell/SUSE
# Copyright (C) 2011 Canonical, Ltd.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of version 2 of the GNU General Public
# License published by the Free Software Foundation.
#
# ------------------------------------------------------------------
#Add your ntpd devices here eg. if you have a DCF clock
# @{NTPD_DEVICE}="/dev/ttyS1"
@{NTPD_DEVICE}="/dev/null"
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