Ethernet interface eth0 not detected in Ubuntu 12.04
I got a new I7 ASUS motherboard P8H77-V (3 PCI Slots for sound cards) and Ubuntu 12.04 64Bit and 32bit versions did not detect the motherboard default Ethernet port.
Check that the led's flicker when you plugin the Ethernet cable, if not check in your bios and enable Ethernet there.
Here is what I had to do to make it work.
Run the following command in your terminal.
You should see the following in the list of devices to confirm this is the Ethernet interface you have.
Ethernet controller: Atheros Communications Inc. AR8161 Gigabit Ethernet (rev 10)
Then install the driver from Ubuntu
Don't get the drivers released after 2012-05-10 it will not work
wget -O- http://linuxwireless.org/download/compat-wireless-2.6/compat-wireless-2012-05-09-p.tar.bz2 | tar -xj
sudo Make install
Then load the new driver module.
sudo modprobe alx
If your network cable is connected with your router on DHCP.
run ifconfig and you should see your interface eth0
ifconfig to see your new ethernet ports.
and it should work now.