/lib/systemd/system/gdm.service is in gdm3 3.14.1-7.
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 13 14 15 16 17 18 19 20 21 22 | [Unit]
Description=GNOME Display Manager
Conflicts=getty@tty7.service plymouth-quit.service
After=systemd-user-sessions.service getty@tty7.service plymouth-quit.service
# GDM takes responsibility for stopping plymouth, so if it fails
# for any reason, make sure plymouth still stops
OnFailure=plymouth-quit.service
[Service]
ExecStartPre=/bin/sh -c '[ "$(cat /etc/X11/default-display-manager 2>/dev/null)" = "/usr/sbin/gdm3" ]'
ExecStartPre=/usr/share/gdm/generate-config
ExecStart=/usr/sbin/gdm3
ExecReload=/bin/kill -HUP $MAINPID
ExecReload=/usr/share/gdm/generate-config
Restart=always
RestartSec=1s
IgnoreSIGPIPE=no
# GDM is killed upon reload if BusName is set, let us forget it for now
#BusName=org.gnome.DisplayManager
StandardOutput=syslog
StandardError=inherit
EnvironmentFile=-/etc/default/locale
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