Here is a guide to update your nvidia driver to the latest version (260.19.29). The current ubuntu version is 260.19.06
To install the latest driver open a Terminal window (Applications -> Accessories -> Terminal) and copy+paste the following lines:
sudo add-apt-repository ppa:ubuntu-x-swat/x-updates
sudo apt-get update
sudo apt-get install nvidia-current nvidia-current-modaliases nvidia-settings
When installad go to System -> Administration -> Additional Drivers and activate the current Nvidia driver (if needed) then reboot your system.
It seems the newest version is 270.18
It will be insytalled from this ppa as well.