Config:

• System:
  • Kernel: 5.4.0-52-generic x86_64
  • Desktop: Cinnamon 4.6.7
  • Distro: Linux Mint 20 Ulyana
  • Base: Ubuntu 20.04 focal
• Graphics:
  • Device: NVIDIA GM204 [GeForce GTX 970]
  • Driver: nvidia v: 450.80.02

Steps:

sudo apt-get purge *nvidia*
sudo apt-get autoremove
reboot

Download nvidia driver

echo 'blacklist nouveau' | sudo tee /etc/modprobe.d/disable-nouveau.conf
sudo update-initramfs -u
reboot

CTRL + ALT + F1

sudo service lightdm stop

Run nvidia installer

sudo service lightdm start

• Run NVIDIA X Server Settings (nvidia-settings)
• Go to X Server Display Configuration
• Click Save to X Configuration File

Sources:

• » Mint 20 Nvidia Driver Installation Update «

• Release Notes for Linux Mint 20 Cinnamon

• Unix Driver Archive

• ACPI errors and graphics card drivers issues
• NVIDIA X server settings is displaying empty window