Bug#803112: Workaround for bug

[debianbug...@gmail.com]

I found out a proper workaround which is to uncomment the line that says 
"WaylandEnable=false" in /etc/gdm3/daemon.conf and then reboot. It is 
necessary to reboot, not just restart gdm3 for some reason. If I just 
restart gdm3 without rebooting I am presented with a flickering screen 
instead of a black screen. However on rebooting everything works as it 
should, I can login by entering my password, stop, start, restart gdm3, 
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