16.04: Graphical login/desktop vanished?

[Ralf Mardorf]

On Sun, 24 Jul 2016 22:30:12 +0200, Josef Wolf wrote:
>the graphical login won't start anymore.

You could start troubleshooting by taking a look at those two log file:

  cd /var/log/
  grep EE Xorg.0.log
  sudo tail -60 lightdm/lightdm.log

Regards,
Ralf