intel or amd cpu?
Anyway use Ubuntu 20.04.
For the amd instructions.
Install a 460+ driver.
If you have this installed:
read the Readme about graphics switching.
Otherwise use prime-select to choose your prime profile (intel|nvidia|on-demand).
That message is normal when the driver is loading, because of the drivers proprietary license.
If all that isn’t working, create a bug-report: run nvidia-bug-report.sh as root (from the tty if you get the black screen) and attach the resulting file here.