Some sources say to just select the "Recommended" Nvidia driver that appears in Driver Manager (which is 470.86-0ubuntu0.20.04.2), then restart.
This doesn't work. Even on a brand new fresh install of 20.3, Driver Manager will crash before installation completes. This also causes the following error when I attempt to install anything via the terminal:
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Waiting for cache lock: Could not get lock /var/lib/dpkg/lock-frontend. It is held by process #### (packagekitd)...
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E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.
I do run the 'sudo dpkg --configure -a' command, it appears as though it's uninstalling the Nvidia driver. It says "Your system has UEFI Secure Boot enabled.", prompts me for a password, says it's setting up a bunch of lib packages and resolves. If I reopen Driver Manager it says that I have nvidia-driver-470 selected. If I run Update Manager and Restart at this point, Driver Manager still shows it as my installed driver.
If I open NVIDIA X Server Settings at this point I get only a blank window with "Help" and "Quit" buttons. And if I open Davinci Resolve it says "Unsupported GPU Processing Mode". I click "Update Configuration", navigate to "Memory and GPU" as every tutorial instructs, but no GPUs appear in the list and the dropdown next to "GPU processing mode" is blank.
I have attempted this entire process may different ways and all have ended up at the same deadend.
I've used Daniel Tufvesson's walkthrough on https://www.danieltufvesson.com/makeresolvedeb and followed it step-by-step, which ignores Driver Manager and involves installing additional lib files but it still doesn't work.
I've even used this extremely disorganized walkthrough from 2014 which has been updated continuously, https://forums.linuxmint.com/viewtopic.php?f=59&t=154932&start=39, which also ignores Driver Manager, involves purging any existing Nvidia drivers, creating a .conf file to disable Nouveau, rebooting into Terminal to stop lightdm, and do some kernel signing module shit that's way over my head... I followed that to a T and still it doesn't work.
And there are yet entirely OTHER walkthroughs on this that insist you have to disable Secure Boot and I don't even know how to do that, especially when this dpkg error seems to enable it. Yet I can Google Youtube videos of people showing that they can select the Recommended Nvidia driver without it crashing, running MakeResolveDeb, and launching Davinci Resolve successfully without any of this bullshit.
It's been incredibly frustrating, and yet the most consistent issue I've noticed, of Driver Manager crashing on installing the recommended Nvidia driver, I can't find any articles online anywhere addressing, and yet this is all on a brand new computer with a brand new graphics card and the latest stable installation of Linux Mint. I've just now erased and reinstalled Mint again, went directly to Driver Manager, tried to install 470 and it crashed, and once again I've installed Davinci and confirmed that it can't detect my GPU.
As far as I've been able to tell, Davinci Resolve 17 can run on my GEFORCE GT 730 and the 470 driver supports it. I've never installed a GPU before, but I'm pretty sure it's installed correctly cause System Info recognizes it.
I'm kinda at my wits' end here, my former iMac's harddrive was dying and I had to backup everything to Time Machine to save it to another computer, but not only has that broken some of the software licenses I had, but PremierePro is suddenly spitting out MPEGImporter errors and, of course, none of the tutorials that claim to fix that problem fix that problem either. I've been meaning to migrate to Linux, but I must have a video editor, and I really want to make Davinci work. I'd really appreciate the help (this is not an invitation to suggest alternative video editors, I am aware of and testing those).
EDIT: Updated my signature with my current specs.