You can get the latest graphics drivers using the following repository, but it is IMPORTANT that you remove the intel-linux-graphics-installer
before doing so.
sudo add-apt-repository ppa:paulo-miguel-dias/pkppa
press yes to add it and then:
sudo apt update && sudo apt upgrade -y
Lastly, reboot your computer and you will have the latest stable graphics driver installed.
There is only one caveat with adding this repository, which might be that you need to remove it before upgrading Ubuntu to let's say Ubuntu 17.10 when that arrives.
You can remove the repository by writing this in the terminal:
sudo apt install ppa-purge
sudo ppa-purge ppa:paulo-miguel-dias/pkppa
sudo apt update && sudo apt upgrade
When the new Ubuntu has been installed, simply add the repository again to automatically get the newest updates again. BTW, this repository also works on Ubuntu 16.04 LTS
This repository will automatically update your graphics driver, whenever a new update is released.