Add the following lines to your /etc/apt/sources.list:
deb http://ppa.launchpad.net/siretart/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/siretart/ppa/ubuntu jaunty main
Import the appropriate GPG key (port 11371 on your firewall must be open to use the keyserver):
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 0xce90d8983e731f79
See https://help.launchpad.net/Packaging/PPA#Adding%20a%20PPA%20to%20your%20Ubuntu%20repositories for additional information how to add GPG keys to your system.
Install the driver:
$ sudo apt-get update
$ sudo apt-get install xserver-xorg-video-intel-2.4
Now you should be set. Restart X by running “sudo /etc/init.d/gdm restart” in a terminal and see if the graphics performance from intrepid is restored.
Do I need to change my xorg.conf file? ==> May not work. Situation not improved without xorg.conf change??
If the driver does not work for you, or is not better, you should rollback to the original Ubuntu one. Remove the two lines from /etc/apt/sources.list again, and install the original one again:
$ sudo apt-get install xserver-xorg-video-intel
If X.org does not start at all, you should change to a text terminal by pressing Ctrl+Alt+F2, logging in, and use “sudo nano” to edit /etc/apt/sources.list. After installing xserver-xorg-video-intel, restart the computer with “sudo reboot”.