Comment 2 for bug 1783438

I do have an NVidia GPU, and am using the drivers from https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa. However, I noticed on a couple of the other similar bugs that have been reported, this repo can also provide packages that prevent the upgrade from working.

So, I'm trying to purge that repo and downgrade the packages, but when I run `sudo add-apt-repository ppa:graphics-drivers/ppa` I get an error that it cannot find the package list for this repo, and as such it refuses to remove it and make the necessary changes. I tried adding the repo again, and then running the same command again to purge it, but same issue.

I just want to get this sorted out. What do I need to do to get this to work properly, short of having to wipe my entire machine, do a fresh install, and spend a week or more restoring my settings and data from backups?