I believe I have found the culprit. Not happy to say that it looks like
it was a configuration change I made to try to fix the ubiquitous
screen-tearing and frame synch problems that some applications have. I
*believed* I had reverted all the changes I made when I saw they hadn't
fixed the issue, apparently I missed one. Oddly, the machine had booted
up into a proper GDM session several times since that attempt. In any
case, I went back over my research and double-checked anything that we
hadn't already covered and found an article about adding a zz-nvidia-
modeset.conf file in the modprobe.d folder. This had one working line in
it:
"options nvidia_drm modeset=1"
Once commented that line out and updated initramfs the machine was able
to make all the way into the full GDM session again.
I am very sorry to wasted your time on this problem that was obviously
due to an oversight on my part.
** Changed in: nvidia-graphics-drivers-390 (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1777378
Title:
[nvidia] GDM no longer presents GUI login Ubuntu 18.04
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