Ubuntu 19.04 NVIDIA Driver Installation Guide
Welcome, Mint User! Install Ubuntu 19.04 Disco NVIDIA Driver by the PPA Repository – Step by step Tutorial.
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.

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Open a Terminal Shell emulator window
Ctrl+Alt+t on desktop
(Press “Enter” to Execute Commands) -
How to Add NVIDIA Driver Ubuntu Repository
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Then Check for the Available NVIDIA Driver.
sudo apt update && apt search nvidia-driver
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Find the Right NVIDIA Driver on your Graphics Card
Take Note of the Driver Release
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Finally, to Install the Right NVIDIA Ubuntu Driver
For Instance to Install the currently Latest one:sudo apt install nvidia-driver-580 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-580 nvidia-settings