Intel wireless-the easy way
1)for first add new repository for gutsy
echo "deb http://archive.ubuntu.com/ubuntu gutsy main restricted universe multiverse" /etc/apt/sources.list
2) update you repositories
sudo apt-get update
3) install new packages
sudo apt-get install linux-image-2.6.22-9-generic linux-headers-2.6.22-9-generic linux-restricted-modules-2.6.22-9-generic linux-ubuntu-modules-2.6.22-9-generic
4)if you are using nvidia-glx, you need to upgrade this package
sudo apt-get install nvidia-glx
5)now you can remove you repository
Intel wireless-the hard way
see this how-to but use the newest versions.
