Comment 18 for bug 1672033

Jeremy, it's not related.

Also, this is how it supposed to work. If gdm thinks it cannot start wayland session, it wont display Wayland option.

Why does gdm thinks Wayland session is not available you ask? Because I presume you have modesetting disabled, because installation or update for nvidia driver overwrites:

/etc/modprobe.d/nvidia-graphics-drivers.conf -> /etc/alternatives/x86_64-linux-gnu_nvidia_modconf

and puts by default:

options nvidia_381_drm modeset=0

which will prevent wayland from working.