/etc/apparmor.d/local/usr.sbin.libvirtd is in libvirt-bin 0.9.8-2ubuntu17.23.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # Site-specific additions and overrides for usr.sbin.libvirtd.
# For more details, please see /etc/apparmor.d/local/README.
|