Find out information about your GPU:
Type either the hwinfo or lshw command to find out info about your GPU:
$ hwinfo --gfxcard --short
$ sudo lshw -C display
Nvidia Driver download page is here
You can install Nvidia drivers either using GUI or CLI method
Open “Software and Updates” app to install install Nvidia driver using GUI
OR
type “sudo apt install nvidia-driver-455” at the CLI
Reboot to load the drivers and verify they are working.