/etc/apparmor.d/abstractions/audio 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.
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# ------------------------------------------------------------------
#
# Copyright (C) 2002-2009 Novell/SUSE
# Copyright (C) 2009 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.
#
# ------------------------------------------------------------------
/dev/admmidi* rw,
/dev/adsp* rw,
/dev/aload* rw,
/dev/amidi* rw,
/dev/audio* rw,
/dev/dmfm* rw,
/dev/dmmidi* rw,
/dev/dsp* rw,
/dev/midi* rw,
/dev/mixer* rw,
/dev/mpu401data rw,
/dev/mpu401stat rw,
/dev/patmgr* rw,
/dev/phone* rw,
/dev/radio* rw,
/dev/rmidi* rw,
/dev/sequencer rw,
/dev/sequencer2 rw,
/dev/smpte* rw,
/dev/snd/* rw,
/dev/sound/* rw,
@{PROC}/asound/** rw,
/usr/share/alsa/** r,
/usr/share/sounds/** r,
owner @{HOME}/.esd_auth r,
owner @{HOME}/.asoundrc r,
/etc/esound/esd.conf r,
# libcanberra
owner @{HOME}/.cache/event-sound-cache.* rwk,
# pulse
/etc/pulse/ r,
/etc/pulse/** r,
/{run,dev}/shm/ r,
owner /{run,dev}/shm/pulse-shm* rwk,
owner @{HOME}/.pulse-cookie rwk,
owner @{HOME}/.pulse/ rw,
owner @{HOME}/.pulse/* rwk,
owner /{,var/}run/user/*/pulse/ rw,
owner /{,var/}run/user/*/pulse/{native,pid} rwk,
owner @{HOME}/.config/pulse/*.conf r,
owner @{HOME}/.config/pulse/client.conf.d/{,*.conf} r,
owner @{HOME}/.config/pulse/cookie rwk,
owner /tmp/pulse-*/ rw,
owner /tmp/pulse-*/* rw,
# libgnome2
/etc/sound/ r,
/etc/sound/** r,
# openal
/etc/openal/alsoft.conf r,
owner @{HOME}/.alsoftrc r,
/usr/{,local/}share/openal/hrtf/{,**} r,
owner @{HOME}/.local/share/openal/hrtf/{,**} r,
# wildmidi
/etc/wildmidi/wildmidi.cfg r,
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