/usr/share/menu/xxkb is in xxkb 1.11-2.1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | ?package(xxkb):needs="x11" section="Applications/System/Administration" \
title="xxkb" command="/usr/bin/xxkb"
|