GNU/Linux KDE Neon Installing GeForce Driver Guide
How to Install NVIDIA GeForce Graphics Driver on KDE Neon GNU/Linux desktop – Step by step Tutorial.
The GeForce Driver KDE Neon 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 KDE Neon Repo, and then possibly the Generic for Linux.

GNU/Linux KDE Neon NVIDIA GeForce Driver Installation Guide