Indeed sounds like the issue I was having -- marking as a duplicate.
FTR, I no longer see an issue with gdm3; but I had reinstalled my system with Ubuntu-GNOME directly, and in that case it worked; so it was indeed due to some issue with what is different between Ubuntu and Ubuntu-GNOME.
Indeed sounds like the issue I was having -- marking as a duplicate.
FTR, I no longer see an issue with gdm3; but I had reinstalled my system with Ubuntu-GNOME directly, and in that case it worked; so it was indeed due to some issue with what is different between Ubuntu and Ubuntu-GNOME.