NVIDIA drivers suddenly stopped working after rebooting from Windows, reinstall fails (Ubuntu 20.04)
Solution 1:
I ran the following today (after purging as described above) and it seems to be working again after a reboot:
sudo add-apt-repository ppa:graphics-drivers/ppa
sudo apt update
sudo apt install nvidia-driver-460
Don't ask me why it works -- I tried literally the same thing yesterday with no success.