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

@polomacnenad Please try this:
https://forums.developer.nvidia.com/t/nvidia-smi-has-failed-because-it-couldn-t-communicate-with-the-nvidia-driver-after-updating-ubuntu-20-04/170985/7?u=generix