NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver

Hi everyone,
After checking the forums and stack overflow for hours, i know that this problem is common, but despite trying everything explained, i can’t fix the problem,
I have unbuntu budgie 20.04.01 LTS, i installed cuda toolkit 11 and nvidia driver 460
when i do :
nvidia-smi
I get:
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’ve tried different drivers there but it doesn’t change the problem.
when i go to /proc/driver/ there is no nvidia there. How can I put the driver here?
Sorry if the question already has been asked, i spent lot of hours on it. Any help welcome.

My problem was: secure boot. I disabled my secure boot and the driver was at the right place.