Monitor shows blackscreen after install driver on Ubuntu-Desktop 20.04

The attachment is the file generated by nvidia-bug-report.sh.

My graphic card is RTX A2000.

I have installed Ubuntu Desktop 20.04 on a HP workstation and I wanted to install nvidia driver to accelerate my Unity3D and ROS2 environment.

But I got black screen after rebooted.

I could use rdp on Win10 to login but I couldn’t see anything through the monitor connected to the nvidia graphic card.

I have tried to disable secure boot and install driver again but monitor couldn’t show anything.

I want to know the reason that result in this problem.
Is there any method to solve this problem?

nvidia-bug-report.log.gz (356.1 KB)