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

GNU/Linux Lubuntu NVIDIA GeForce Driver Installation Guide