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When I boot up my Lenevo V570 to ubuntu 11.10 then it shows me 'Wireless hardware switch off' however when i use windows and then reboot ubuntu then it works properly.

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What does your rfkill list say?

Try to type into your terminal 'rfkill unblock wifi' or 'rfkill unblock wlan'. You might need to execute this as root ('sudo').

Good luck.

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