I recently updated to 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. I am using the latest nvidia-390 driver. My laptop has a dual graphics card ie. Intel and Nvidia. I would be fine staying with Wayland however it seems unstable and a dual monitor setup isn't working. Any thoughts what I can do to get this working so I can use Xorg .
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You can try to inspect /var/log/Xorg.0.log.
I also had this issue. In my case, the reason was a corrupt file /etc/X11/xorg.conf.d/50-synaptics.conf which had the following line:
Example # xorg.conf.d que snippet assigns the touchpad driver
which was supposed to be:
# Example xorg.conf...
