Install NVIDIA 820M Driver - Ubuntu 20.04

Im’ trying to install NVIDIA 820M, but Ubuntu only accepts the alternative driver

If I try to install the proprietary, I receive a black screen and have to purge the driver to get the GUI back

I’ve tried the provided on NVIDIA webstie, but it recommends to install via Ubuntu interface

Some safe way to install this driver?

The 820m is likely Fermi-based, so try the 390 driver. Please run as root and attach the resulting nvidia-bug-report.log.gz file to your post.