Ubuntu 12.10 Dell Inspiron Wifi off

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http://askubuntu.com – I installed a fresh install of Ubuntu 12.10 and this is my first Ubuntu install. I have a Dell Inspiron 6400 and my wifi is turned off and cant seem to switch it on. I searched a lot on it but can only find answers for Ubuntu 12.04 :( can someone help me please? Thanks in advance (HowTos)