Before you are following this tutorial, you should disable wireless using command below
First download driver here~$ rfkill list all
http://www.orbit-lab.org/kernel/compat-wireless-3-stable/v3.5/compat-wireless-3.5.1-1-snpc.tar.bz2
And then extract that archive using command at below
~$ tar -xf compat-wireless-3.5.1-1-snpc.tar.bz2Change your directory active to the directory of extracted it archive
~$ cd compat-wireless-3.5.1-1-snpcExecution that script
~$ ./scripts/driver-select alxFinish :)
~$ make
~$ sudo make install
~$ sudo modprobe alx
If you are geting a problem, you can leave a comment.
source http://ubuntuforums.org/showthread.php?t=2050126
Paper 4Share - [SOLVED] Wired Internet Connection Problem On Ubuntu 12.04