Amigo,
veja aqui: http://ubuntuforums.org/showthread.php?t=1505697Your ethernet hardware seems to be quite new and doesn't have a driver built into Ubuntu as of yet. However, there's a driver included in the compat-wireless stack that you can use (I have no idea why they included an ethernet driver in compat-wireless, but according to these emails, someone did).
To download, compile and install the driver, first go to
http://linuxwireless.org/download/compat-wireless-2.6 and download the file named "compat-wireless-2.6.tar.bz2" (you can't download it in the terminal because of anti-hotlinking). Save it to your desktop. Then run these commands:
No caso, baixe o arquivo
compat-wireless-2.6.tar.bz2 para sua Desktop
execute estes comandossudo apt-get update
sudo apt-get install build-essential
cd ~/Desktop
tar -xjvf compat-wireless-2.6.tar.bz2
cd compat-wireless*
scripts/driver-select atl1c
make
sudo make install
Sua internet deverá funcionar ao iniciar, caso contrário, execute o comando:sudo modprobe atl1c