haven't tried yet but i have put the same gpu in another system and i was able to download drivers and it worked fine i may not be able to download windows for a few days though
Was this machine also using Pop? As I said earlier, I highly suggest using the latest Ubuntu LTS with the HWE stack. If the GPU was able to work on another machine, I would blame your OS installation, particularly since dkms is freaking out with your existing install. You're doing something wrong because it really shouldn't be this difficult. The only thing that would be easier would be getting a fairly modern AMD card, which has drivers that ship with the kernel so you don't have to install anything.
Just for shits and giggles, could you run `uname -a` so we know what kernel version you're running? dkms errors usually have to do with the kernel module being built or installed (that is, the nVidia driver itself,) and I don't typically see this unless something is incompatible with the current kernel version or if the install is really screwed up.