Install nvidia drivers for Ubuntu 18.04 SERVER
Run the following commands in your terminal to install the latest NVIDIA Drivers:
sudo add-apt-repository ppa:graphics-drivers/ppa
sudo apt update
sudo apt-get install ubuntu-drivers-common
sudo ubuntu-drivers autoinstall
If you get any unmet dependencies problems, manually install those unmet dependencies. For example, if you get:
nvidia-driver-418 : Depends: xserver-xorg-video-nvidia-418 (418.56-0ubuntu0~gpu18.04.1) but it is not going to be installed
Run:
sudo apt install xserver-xorg-video-nvidia-418 nvidia-driver-418
Finally, reboot.