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I have recently built a computer with LAN chipset Realtek 8111E, and installed Ubuntu 12.04. I am connected to the Internet via a wired connection, but it is currently not detecting any wireless networks. After downloading and installing a driver from Realtek's website, it still doesn't work. Can anyone help?

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Realtek 8111E is not your wireless chipset, it is your Ethernet (wired) chipset. They are separate. Please post the output of lspci -v | grep Net so we can see what your wireless chipset might really be. –  tgies Dec 29 '12 at 14:52
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Also, as a general rule, it's a bad idea to install a manufacturer's driver for anything in Linux until you've exhausted all other possible solutions. OEM drivers have a notorious tendency to be bad, and Ubuntu probably provides the driver you need, anyway, packaged specifically to work with your Ubuntu system. –  tgies Dec 29 '12 at 14:53
    
Welcome to Ask Ubuntu! Please start troubleshooting here: My WiFi adapter is not working at all. Where to start troubleshooting? –  gertvdijk Jan 3 '13 at 13:13
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