Bad news: "Non-free firmware is required" ( http://wiki.debian.org/iwlagn ).
Indeed, you can read the license Intel distributes it (
http://intellinuxwireless.org/tar.php?p=iwlwifi&f=LICENSE.iwlwifi-6050-ucode&a=iwlwifi-6050-ucode-41.28.5.1.tgz
). That is not free software.
It means this device will not work with Linux-libre (therefore with any 100%
Libre OS such as Trisquel) until this firmware is liberated (or a replacement
is written).
You can:
1) Use a cable (i.e., the Ethernet iterface);
2) Buy a Wifi dongle after checking its compatibility with Linux-libre on
h-node ( http://www.h-node.com/wifi/catalogue/en ) or testing it (maybe other
users may indicate models too);
3) Add the faulty Wifi device on h-node;
4) Write to Intel and convince them to liberate their firmware;
5) Eat a banana and relax.
