This sounds like it might be bug 1798790. Please try this workaround:
1. Edit /etc/gdm3/custom.conf and uncomment the line:
#WaylandEnable=false
2. Reboot
** Package changed: xorg (Ubuntu) => gdm3 (Ubuntu)
** Changed in: gdm3 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1830000
Title:
NVIDIA driver (390) does not allow progress to login screen
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