All I did is installed Ubuntu 12.04 (with Ethernet cable connected when installing), and I got no wireless connection when I remove the cable. I also ran this command:
sudo rfkill list all
and the output is:
dell-wifi: Wireless LAN
Soft blocked: no
Hard blocked: no
I disabled Fn+F2 at the boot level, so only wifi is on and bluetooth is off and Fn+F2 has no effect (so it is always on).
Please post the solution, I really need it, thanks