Unable to install Nvidia 465 on Ubuntu 18.04 with RTX 3070

I am trying to install Nvidia Drivers on Ubuntu 18.04 (MSI GP76 with RTX 3070 and i7 10th Gen laptop ).

I installed nvidia-driver-465(Tried 460 also but no use) using software & updates. It looks like installed but I am getting the following error with nvidia-smi command.
NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running.

I have tried the following approaches but nothing worked.

  • Secure Boot Disabled
  • No Nvidia blacklist files
  • Disabled wayland
  • Kernel using 5.4.0-73-generic

I am attaching bug report. nvidia-bug-report.log.gz (2.1 MB)

The command grep -r nvidia /etc/modprobe.d/* /lib/modprobe.d/* gives me the following
/lib/modprobe.d/nvidia-kms.conf:# This file was generated by nvidia-prime /lib/modprobe.d/nvidia-kms.conf:options nvidia-drm modeset=1

Have been trying to resolve this issue since multiple days.