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I have Sony Vaio and this is my first time running Linux. I have installed ubuntu 12.10 and my wireless was working fine. Just two days ago it stopped working and I don't know why. It says I have the wireless adapter switched off.

And under System Settings > Network > Wireless my hardware address is visible.
So I think it working good, but there is something wrong.

How can I fix this?

share|improve this question
Is there a key combination to enable/disable your wireless on your keyboard? (e.g. Fn + F3). I have similar issue with my Dell laptop, and every time I boot ubuntu, I have to manually activate wireless. – Milan Todorovic Nov 30 '12 at 14:02
Welcome to Ask Ubuntu! We need more hardware information to help you, can you look at this question and then edit your question adding the information. – Jorge Castro Nov 30 '12 at 14:58

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