自从买了Asus Eeepc px1015之后，小毛病不断，不过也不能怪asus，只能说他们从来不把linux用户当用户而已。
lshw -C Network
Your 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 (the first two commands require that you either have an Internet connection, or have your Ubuntu installation CD enabled as a software repository):
sudo apt-get update
sudo apt-get install build-essential
cd ~/Desktop tar -xjvf compat-wireless-2.6.tar.bz2
make sudo make install
Then reboot. Hopefully your ethernet will work automatically after reboot; if not, run:
to insert the driver.
整体解释一下就是在经过了查看各种网络设置之后发现硬件驱动坑爹了，而与此同时drivers for ubuntu又不存在。