GNU/Linux Mint 19 Installing GeForce Driver Guide
Hi! The linked Tutorial shows you Step-by-Step How to Install NVIDIA GeForce Graphics and GPU Driver in GNU/Linux Mint 19.x Tara/Tessa/Tina/Tricia Desktop.
The GeForce Driver Mint 19 Setup is a breeze, requiring just a few straightforward Shell Commands to complete.
Most noteworthy: first try with the Recommended NVIDIA Driver Setup from Apt Mint Repo, and then possibly the Generic for Linux.
GNU/Linux Mint 19 NVIDIA GeForce Driver Installation Guide