I am running a rtx 2060 maxq on ubuntu 20.04. On the Additional Drivers tab of Software & Updates I am listed as “Using NVIDIA driver metapackage from nvidia-driver-470 (proprietary)”
usr@user:~$ prime-select query
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 seen some similar error messages on othe message boards but their solotions didnt seem to resolve this issue for me.