On some pretty new Asus laptops, e.g. X55U, you will discover that after installing Ubuntu 12.04 your wired network isn't working.
eth0 completely disappeared.

The cause: the driver for your network card isn't supported yet.

The solution: can be found here. It mentions 2 solutions. I tried the second and that didn't work :(.

My advice: try the second and if that doesn't work, do the first. That will definitely work - perform the following in a terminal (ctrl+alt+t):

sudo apt-get install build-essential linux-headers-generic linux-headers-`uname -r`
wget -O- http://linuxwireless.org/download/compat-wireless-2.6/compat-wireless-2012-07-03-pc.tar.bz2 | tar -xj
cd compat-wireless-2012-07-03-pc
./scripts/driver-select alx
make
sudo make install

There's one thing: you need a network connection for both solutions... duh... in my case, my wireless worked. If your wireless doesn't work, then temporarily remove the wireless security, apply the solution as mentioned above and put the security of your wireless router back on! Good luck!

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