gdm3 3.22.3-3+deb9u2 / lib / systemd / system / gdm3.service

/lib/systemd/system/gdm3.service is in gdm3 3.22.3-3+deb9u2.

This file is owned by root:root, with mode 0o777.

It is a symlink to /lib/systemd/system/gdm.service