● gdm.service - GNOME Display Manager
   Loaded: loaded (/lib/systemd/system/gdm.service; static; vendor preset: enabled)
  Drop-In: /lib/systemd/system/display-manager.service.d
           └─xdiagnose.conf
   Active: active (running) since Thu 2016-04-21 19:12:57 EDT; 3min 39s ago
  Process: 13638 ExecStartPre=/usr/share/gdm/generate-config (code=exited, status=0/SUCCESS)
  Process: 13629 ExecStartPre=/bin/sh -c [ "$(cat /etc/X11/default-display-manager 2>/dev/null)" = "/usr/sbin/gdm3" ] (code=exited, status=0/SUCCESS)
 Main PID: 13662 (gdm3)
    Tasks: 3 (limit: 512)
   CGroup: /system.slice/gdm.service
           └─13662 /usr/sbin/gdm3

Apr 21 19:13:40 derek-G551JW gdm3[13662]: Unable to kill session worker process
Apr 21 19:13:40 derek-G551JW gdm-launch-environment][1003]: pam_unix(gdm-launch-environment:session): session opened for user gdm by (uid=0)
Apr 21 19:13:40 derek-G551JW gdm3[13662]: Child process -1078 was already dead.
Apr 21 19:13:40 derek-G551JW gdm3[13662]: Child process -1078 was already dead.
Apr 21 19:13:40 derek-G551JW gdm-launch-environment][1114]: pam_unix(gdm-launch-environment:session): session opened for user gdm by (uid=0)
Apr 21 19:13:40 derek-G551JW gdm3[13662]: GdmLaunchEnvironment: Unknown user gdm
Apr 21 19:13:40 derek-G551JW gdm3[13662]: GLib-GObject: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Apr 21 19:13:40 derek-G551JW gdm3[13662]: Child process -1188 was already dead.
Apr 21 19:13:40 derek-G551JW gdm3[13662]: Child process 1114 was already dead.
Apr 21 19:13:40 derek-G551JW gdm3[13662]: Unable to kill session worker process