Ubuntu 10.04 LTS & Ethernet controller: Atheros Communications AR8151 v1.0 Gigabit Ethernet

sudo apt-get install linux-headers-$(uname -r) build-essential

Download Driver:
http://code.google.com/p/iats/downloads/detail?name=AR81Family-Linux-v1.0.1.9.tar.gz&can=2&q=

mkdir AR81Family
mv AR81Family-Linux-v1.0.1.9.tar.gz AR81Family
cd AR81Family
tar zxvf AR81Family-Linux-v1.0.1.9.tar.gz
sudo su
make install
modprobe atl1e
exit