Ubuntu 19.04 NVIDIA Driver Installation Guide
Welcome, Mint User! The Tutorial shows you Step-by-Step How to Install Ubuntu 19.04 Disco NVIDIA Driver by the PPA Repository.
And then to Install NVIDIA Ubuntu 19.04 Driver you have First, to Find the Right Release for your Graphics Card.
Finally, with nvidia-settings Tool you can configure Brightness, Gamma, XVideo attributes, Temperature, and OpenGL.

Open a Terminal Shell emulator window
Ctrl+Alt+t on Desktop
(Press “Enter” to Execute Commands)How to Add NVIDIA Driver Ubuntu Repository
Then Check for the Available NVIDIA Driver.
sudo apt update && apt search nvidia-driver
Find the Right NVIDIA Driver in your Graphics Card
Take Note of the Driver Release
Finally, to Install the Right NVIDIA Ubuntu Driver
For Instance to Install the currently Latest one:sudo apt install nvidia-driver-555 nvidia-settings
And in case of Issue try instead with the more powerful aptitude Package Installer.
So first, to Install Aptitude run:sudo apt install aptitude
And next try the Setup again playing:
sudo aptitude install nvidia-driver-555 nvidia-settings