Actually I suspect the problem here is kernel update 5.8.0-45.51 (which you would avoid briefly on a fresh reinstall). Please check to see if this is the same as bug 1919285 (meaning using an older kernel like 5.8.0-44 fixes it).
** Changed in: ubiquity (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1919248 Title: Nvidia driver never usable if Ubuntu was installed in safe graphics mode To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1919248/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs