Oh mainline kernels probably don't support the Nvidia driver. Or perhaps just don't have the nvidia kernel driver built for them. So your GPU missing is expected in that case. I was hoping you still had the official Ubuntu kernel 6.3 installed from before the upgrade to 6.5 where nvidia was still supported...
But we still need to test older kernels so please try:
Oh mainline kernels probably don't support the Nvidia driver. Or perhaps just don't have the nvidia kernel driver built for them. So your GPU missing is expected in that case. I was hoping you still had the official Ubuntu kernel 6.3 installed from before the upgrade to 6.5 where nvidia was still supported...
But we still need to test older kernels so please try:
sudo apt install --reinstall nvidia-dkms-535
to get it working on your 6.3 kernel.