/usr/bin/xubuntu-numlockx is in xubuntu-default-settings 18.04.6.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #!/bin/sh
xf=/etc/X11/Xsession.d/55numlockx
if [ -r $xf ]; then
. $xf
fi
exit 0
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