● 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: inactive (dead) since Fri 2016-04-29 14:55:22 CEST; 39s ago
     Docs: man:lightdm(1)
  Process: 1708 ExecStart=/usr/sbin/lightdm (code=exited, status=0/SUCCESS)
  Process: 1690 ExecStartPre=/bin/sh -c [ "$(basename $(cat /etc/X11/default-display-manager 2>/dev/null))" = "lightdm" ] (code=exited, status=0/SUCCESS)
 Main PID: 1708 (code=exited, status=0/SUCCESS)

Apr 29 14:55:22 yoda systemd[1]: Starting Light Display Manager...
Apr 29 14:55:22 yoda lightdm[1708]: /etc/modprobe.d is not a file
Apr 29 14:55:22 yoda lightdm[1708]: /etc/modprobe.d is not a file
Apr 29 14:55:22 yoda lightdm[1708]: /etc/modprobe.d is not a file
Apr 29 14:55:22 yoda lightdm[1708]: /etc/modprobe.d is not a file
Apr 29 14:55:22 yoda lightdm[1708]: /etc/modprobe.d is not a file
Apr 29 14:55:22 yoda lightdm[1708]: update-alternatives: error: no alternatives for x86_64-linux-gnu_gfxcore_conf
Apr 29 14:55:22 yoda systemd[1]: Stopped Light Display Manager.