Installing a new nvidia driver
The following commands are to be run from a terminal window to install the latest (BETA) NVIDIA drivers:
First, set up the graphics-drivers ppa:
sudo add-apt-repository ppa:graphics-drivers/ppa
Then update and install drivers:
sudo apt update
sudo apt install nvidia-370
Hope this helps!
Assuming you are on the 64-bit version of Ubuntu 16.04, the latest driver for the Nvidia 860M is version 367.44.
You should be able to install from Terminal,
sudo apt-get install nvidia-367
This should replace your old driver with the new version.