Nvidia-smi "No devices were found" on Ubuntu 22.04 LTS

I’m having a weird error trying to run Davinci Resolve on Ubuntu. There seems to be some sort of compatibility error between the Nvidia drivers and the OS.
I have the proprietary Nvidia driver 525 installed through Software&Updates. Secondary monitors work correctly, but $lspci doesn’t see anything to do with Nvidia.
I also can’t run Nvidia-bug-report.sh - the directory described here doesn’t exist, and I’m getting the same “command not found.”
I’ve spent a lot of time trying to figure this out, and I’m not sure where to go from here. Any ideas?