I tried to install CUDA Toolkit 12.1. I have
Nvidia Driver Version: 450.119.03
CUDA Version: 11.0
I received an installation error
ERROR: An NVIDIA kernel module ‘nvidia-drm’ appears to already be loaded in your kernel. This may be because it is in use (for example, by an X server, a CUDA program, or the NVIDIA Persistence Daemon), but this may also happen if your kernel was configured without support for module unloading. Please be sure to exit any programs that may be using the GPU(s) before attempting to upgrade your driver. If no GPU-based programs are running, you know that your kernel supports module unloading, and you still receive this message, then an error may have occurred that has corrupted an NVIDIA kernel module’s usage count, for which the simplest remedy is to reboot your computer.
I did not understand the error. Any explanation regrading this will be helpful.