Alt.bin

nvidia graphic card : easy ( In Ubuntu : System Settings, Advanced, Restricted Drivers, etc )

Intel Wifi IW 4965:

The drivers work on the fly in Kubuntu/Ubuntu Gutsy Gibbon, but if you use the default config with “network manager”, it can’t connect to your DHCP server, and forget about WEP or WPA too..

So yeah, just get rid of network-manager and install wicd :

sudo apt-get remove network-manager

sudo kate /etc/network/interfaces
or :
sudo gedit /etc/network/interfaces

get rid of anything but :

auto lo
iface lo inet loopback

now install wicd

sudo apt-get install wicd

that’s it, wicd works with encryption too