/etc/apparmor.d/abstractions/ubuntu-xterm is in apparmor 2.8.95~2430-0ubuntu5.
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 | # vim:syntax=apparmor
#
# for allowing access to xterm
#
#include <abstractions/consoles>
/dev/ptmx rw,
/{,var/}run/utmp r,
/etc/X11/app-defaults/XTerm r,
# do not use ux or Ux here. Use at a minimum ix
/usr/bin/xterm ix,
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