Current "fix" / workaround, per my own post in #1752053:
I managed to fix my setup by using the Graphics Drivers PPA (https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa) and forcing the install of version 390.25-0ubuntu0~gpu18.04.1 (apt-get install nvidia-390=390.25-0ubuntu0~gpu18.04.1 or something). I suspect version 390.25-0ubuntu1 is broken.
Current "fix" / workaround, per my own post in #1752053:
I managed to fix my setup by using the Graphics Drivers PPA (https:/ /launchpad. net/~graphics- drivers/ +archive/ ubuntu/ ppa) and forcing the install of version 390.25- 0ubuntu0~ gpu18.04. 1 (apt-get install nvidia- 390=390. 25-0ubuntu0~ gpu18.04. 1 or something). I suspect version 390.25-0ubuntu1 is broken.