WiFi is not working in Xubuntu 12.10

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http://askubuntu.com – My laptop is Dell Vostro 2520. I tried both Xubuntu and Ubuntu on it, I've used 12.04 & 12.10. WiFi fails to work in all the cases - when i try to switch WiFi by a hotkey (fn+f2) the Bluetooth icon appears in the system tray but the light for the WiFi on lower left corner panel doesn't turn on. I tried the solution of connecting to the network via cable: sudo apt-get install linux-headers-generic sudo apt-get install --reinstall bcmwl-kernel-source sudo modprobe wl from the similar thread Ubuntu 12.10, Wireless not working Could you help me? Many thanks in advance! Update 1 It was (HowTos)