● lightdm.service - Light Display Manager
   Loaded: loaded (/lib/systemd/system/lightdm.service; static; vendor preset: enabled)
   Active: failed (Result: start-limit) since So 2016-03-27 21:43:56 CEST; 15s ago
     Docs: man:lightdm(1)
  Process: 5141 ExecStartPre=/bin/sh -c [ "$(basename $(cat /etc/X11/default-display-manager 2>/dev/null))" = "lightdm" ] (code=exited, status=1/FAILURE)

Mär 27 21:43:56 kassiopeia systemd[1]: Failed to start Light Display Manager.
Mär 27 21:43:56 kassiopeia systemd[1]: lightdm.service: Unit entered failed state.
Mär 27 21:43:56 kassiopeia systemd[1]: lightdm.service: Failed with result 'exit-code'.
Mär 27 21:43:56 kassiopeia systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
Mär 27 21:43:56 kassiopeia systemd[1]: Stopped Light Display Manager.
Mär 27 21:43:56 kassiopeia systemd[1]: lightdm.service: Start request repeated too quickly.
Mär 27 21:43:56 kassiopeia systemd[1]: Failed to start Light Display Manager.
Mär 27 21:43:56 kassiopeia systemd[1]: lightdm.service: Unit entered failed state.
Mär 27 21:43:56 kassiopeia systemd[1]: lightdm.service: Failed with result 'start-limit'.