Nvidia rtx 3060 with Ubuntu 20.04 not working

This could be a repeat question, from

But the solutions from the above did not help.

nvidia-bug-report.log (1.6 MB)

I have uploaded the bug report as well. Installed the proprietary drivers from the software & updates, with driver version nvidia - 470.

However, nvidia SMI throws the error :

NVIDIA-SMI has failed because it couldn’t communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running.

After turning off the secure boot, the issue seems to be resolved, but this disrupts the GUI and it hangs / grains on screen / lines and renders Ubuntu inoperable, as a typical Graphic driver issue.

Please help me in resolving this issue and thanks a lot in advance!!

Please set kernel parameter
and disable secure boot in bios. If you’re having screen corruption with this, it might point to defective video memory.