/etc/apparmor.d/abstractions/kerberosclient 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) 2009-2011 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.
#
# ------------------------------------------------------------------
# files required by kerberos client programs
/usr/lib{,32,64}/krb5/plugins/libkrb5/ r,
/usr/lib{,32,64}/krb5/plugins/libkrb5/* mr,
/usr/lib/@{multiarch}/krb5/plugins/libkrb5/ r,
/usr/lib/@{multiarch}/krb5/plugins/libkrb5/* mr,
/usr/lib{,32,64}/krb5/plugins/preauth/ r,
/usr/lib{,32,64}/krb5/plugins/preauth/* mr,
/usr/lib/@{multiarch}/krb5/plugins/preauth/ r,
/usr/lib/@{multiarch}/krb5/plugins/preauth/* mr,
/etc/krb5.keytab rk,
/etc/krb5.conf r,
# config files found via strings on libs
/etc/krb.conf r,
/etc/krb.realms r,
/etc/srvtab r,
# credential caches
/tmp/krb5cc* r,
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