/etc/apparmor.d/abstractions/dovecot-common is in apparmor 2.12-4ubuntu5.
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 16 17 18 19 | # ------------------------------------------------------------------
#
# Copyright (C) 2014 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.
#
# ------------------------------------------------------------------
# used with dovecot/*
capability setgid,
deny capability block_suspend,
# dovecot's master can send us signals
signal receive peer=/usr/sbin/dovecot,
/{var/,}run/dovecot/config rw,
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