Ubuntu 14.04 not recognizing installed Intel graphics driver

You could try installing the intel-linux-graphics-installer. I have personally used it with various sandybridge cards, it won't hurt to give it a try.

If you don't have gdebi I recommend installing deb packages with gdebi to fix dependency issues that may arrise:

sudo apt-get update && sudo apt-get install gdebi

now download the installer from 01.org

wget https://download.01.org/gfx/ubuntu/14.04/main/pool/main/i/intel-linux-graphics-installer/intel-linux-graphics-installer_1.0.6-0intel1_amd64.deb

make the deb executable and install using gdebi:

sudo chmod +x intel-linux-graphics-installer_1.0.6-0intel1_amd64.deb
sudo gdebi intel-linux-graphics-installer_1.0.6-0intel1_amd64.deb

Now, to run the installer just use the following command:

intel-linux-graphics-installer

reboot for your changes to take effect.

More info about Intel Open Source Technologies can be found here

https://01.org

and here

https://01.org/linuxgraphics/downloads/2014/intelr-graphics-installer-1.0.6-linux