I recently upgraded to 18.04. Currently, I get to the login screen just fine. If I attempt to login, I am confronted with a black screen and nothing more. I can drop to the terminal at the login screen, login through the terminal, enter startx and now I'm at my desktop. I am pretty sure that this is an nvidia issue as I'm continuously getting crash reports popping up for libnvidia-gl-390 install, but when i try to install this manually from the terminal, no issues.
Output of "find ~/ -mount ! -user michael"
sudo find ~/ -mount ! -user michael [sudo] password for michael: /home/michael/.wget-hsts /home/michael/Downloads /home/michael/.dbus /home/michael/.dbus/session-bus /home/michael/.dbus/session-bus/cd82760ca7c64274a03b987139d8bbd9-1 /home/michael/Videos /home/michael/Documents /home/michael/Pictures /home/michael/Public /home/michael/Music /home/michael/Desktop /home/michael/.cache/dconf