The quickest way to update you drivers for Nividia video card since it’s a proprietary driver is …
Go to terminal and run
sudo apt-add-repository ppa:xorg-edgers/ppa
sudo apt-get update
sudo apt-get install nvidia-current nvidia-settings
Leave window and search for “additional drivers” application. In LightDM desktop just search for that string.
Run it and after a few seconds it will list all drivers. Just choose the latest one from Nividia and you are good to go.