[GTALUG] Can't boot using Xorg, only Wayland works on Ubuntu 18.04

[Jim Ruxton]

>>>> I recently updated to Ubuntu 18.04 and cannot boot using Xorg only
>>>> Wayland. I have tried reinstalling xorg, reinstalling nvidia drivers,
>>>> setting |WaylandEnable=false| in |/etc/gdm/custom.conf| but whenever
>>>> trying to login using Xorg I get a frozen screen and mouse.
>>> On my 18.04 system, gdm is running under Xwayland no matter what session
>>> I choose. So I'd suggest commenting out the WaylandEnable=false unless
>>> the gdm login isn't visible on your system.
>> If I don't comment out WaylandEnabled = false I can't even get to the
>> login screen so yes I have to comment this out.
>>> Also, the first time I explicitly chose "GNOME on Xorg" at the password
>>> "cog", I got a blank screen with just a mouse cursor. On reboot, GNOME
>>> is happily running on Xorg ($DESKTOP_SESSION is "gnome-xorg") — but
>>> Xwayland's still running too.
>>>
>>> Xorg is supposed to be the default for new installations under 18.04,
>>> and I was definitely running it under 17.10. I was surprised to find
>>> that after the upgrade I'd been pushed over to Xwayland.
>> I am  in the same boat, was using Xorg  on 17.10 but cannot get it to
>> work in 18.04. Maybe the only way to get it back is a clean install?
> https://bugs.launchpad.net/ubuntu/bionic/+source/gdm3/+bug/1766137 looks
> relevant - with a link to https://bugzilla.gnome.org/show_bug.cgi?id=795940
Thank you I looked at this however there is no discussion with that bug 
to suggest a problem with logging in on Xorg vs Wayland so it appears to 
be a different issue.
jim