Debian Install Intel Wireless WiFi
Intel Wireless WiFi Link, Wireless-N, Advanced-N, Ultimate-N devices
Add a “non-free” component to /etc/apt/sources.list, for example:
deb http://http.debian.net/debian/ wheezy main contrib non-free
Update the list of available packages and install the firmware-iwlwifi package:
sudo apt-get update && apt-get install firmware-iwlwifi
As the iwlwifi module is automatically loaded for supported devices, reinsert this module to access installed firmware:
sudo modprobe -r iwlwifi
sudo modprobe iwlwifi