I was able to finally track down this issue. The issue is due to the 32bit packages being installed if you have 'sudo dpkg --add-architecture i386'. If you do, 'sudo apt install nvidia-legacy-390xx-driver' will install libnvidia-cfg1 (which is an nvidia 460 component) that causes the initial issue and you won't have the driver installed properly.
Two workarounds if you need 32bit support like I do: 1. 'sudo apt install libnvidia-legacy-390xx-cfg1 nvidia-legacy-390xx-driver' This will prevent libnvidia-cfg1 from being installed and things will be happy for your nvidia 400/500 series like mine. 2. Install normally and ignore the warning about the GPU not being supported. Once it's installed, do this before you reboot: 'sudo apt purge --autoremove libnvidia-cfg1' then reboot. You should be good now. Option #1 is preferable as I don't know if installing updates down the road for Option #1 would cause libnvidia-cfg1 to be installed. I assume it will be fine but you know what they say about 'assume'.
