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My Lenovo G480 does not detect my wireless network when I'm running Ubuntu, but it has no problem in Windows 7. When I boot with Ubuntu, it immediately displays a message saying "You are disconnected." and when I try to check for wireless networks, it doesn't display anything.

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sudo service network-manager restart , try this – Qasim Apr 24 '13 at 3:59

While I don't have this particular model laptop, I did a little research and found the following Link to UbuntuForums I have listed the relevant commands below....

Connect to the internet using a wired connection. Type the following to get to a terminal CRTL T (hold down the ctrl key and hit t) copy/paste the commands, one line at a time into the terminal window. reboot and try a WIFI connection.

sudo apt-get install linux-headers-generic build-essential
tar -xf compat-wireless-3.5.1-1-snpc.tar.bz2
cd compat-wireless-3.5.1-1-snpc
./scripts/driver-select alx
sudo make install
sudo modprobe alx
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