● lightdm.service - Light Display Manager
   Loaded: loaded (/lib/systemd/system/lightdm.service; enabled; vendor preset: enabled)
  Drop-In: /lib/systemd/system/display-manager.service.d
           └─xdiagnose.conf
   Active: failed (Result: start-limit) since Tue 2015-06-02 10:15:53 EDT; 5min ago
     Docs: man:lightdm(1)
  Process: 1691 ExecStart=/usr/sbin/lightdm (code=exited, status=1/FAILURE)
  Process: 1686 ExecStartPre=/bin/sh -c [ "$(basename $(cat /etc/X11/default-display-manager 2>/dev/null))" = "lightdm" ] (code=exited, status=0/SUCCESS)
 Main PID: 1691 (code=exited, status=1/FAILURE)

Jun 02 10:15:53 attente systemd[1]: lightdm.service failed.
Jun 02 10:15:53 attente systemd[1]: lightdm.service holdoff time over, scheduling restart.
Jun 02 10:15:53 attente systemd[1]: start request repeated too quickly for lightdm.service
Jun 02 10:15:53 attente systemd[1]: Failed to start Light Display Manager.
Jun 02 10:15:53 attente systemd[1]: Unit lightdm.service entered failed state.
Jun 02 10:15:53 attente systemd[1]: Triggering OnFailure= dependencies of lightdm.service.
Jun 02 10:15:53 attente systemd[1]: lightdm.service failed.
Jun 02 10:15:56 attente systemd[1]: start request repeated too quickly for lightdm.service
Jun 02 10:15:56 attente systemd[1]: Failed to start Light Display Manager.
Jun 02 10:15:56 attente systemd[1]: lightdm.service failed.