0.Confirm your Gigabit Ethernet verison
root@Alan-dell-14R-Turbo:~# lspci | grep Ethernet
03:00.0 Ethernet controller: Atheros Communications Inc. AR8161 Gigabit Ethernet (rev 10)
1.Download Driver Package.
sudo su - #input your password
wget http://linuxwireless.org/download/compat-wireless-2.6/compat-wireless-2012-03-12-p.tar.bz2
2.Uncompress files and exec commands.
tar xvf compat-wireless-2012-03-12-p.tar.bz2
cd compat-wireless-2012-03-12-p
./scripts/driver-select alx
make
make install
./scripts/alx-enable atl1c
./scripts/alx-enable alx
modprobe alx