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It shows that my laptop is now airplane mode, i can't turn on wifi. After i turned off the airplane mode, still can't turn on wifi. What is the problem?

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Can you paste the result of lspci | grep -i net. Also please check if your machine have any hardware wifi toggle button. If yes, make sure it is turned on. –  devav2 Aug 28 '12 at 13:07

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try restart. try sudo rfkill unblock wifi

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