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Wifi does not work at all on Inspiron 3521 after installing Ubuntu 12.04.. When I type in lspci -nn the wireless device is even not on the list.

Please help in this topic!

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Please edit your question to add details: lspci -nn. Maybe we can spot your wireless device. –  chili555 Sep 18 '13 at 2:54
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1 Answer

Some wireless cards are actually listed as USB.

lsusb

will show these.

Check your keyboard. I've had several laptops which have a Fn blue colored key with a wireless icon above the function key that turns on/off the wireless. This is due to the massive power drain wifis require, so they design a soft power switch for this component.

These people were able to get it working with a little trick to force the power profile to reset the wifi.

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