Bug#958025: gnome-shell: Wayland session never starts

[Xerz]

Hi, would like to confirm I seem to have the same issue despite 
libatspi2.0-0, libatk1.0-0 and libpulse0 being automatically installed 
and properly up-to-date. Since I don't know how to debug it, however, 
all I could gather is that the Wayland GDM session freezes during 90 
seconds and then switches back to X11. I tried to set the variable 
AT_NO_BRIDGE=1 to no success. Any further help to debug would be 
welcome.