I'm using Ubuntu 12.10 and the network adapter suddenly stopped working. Running ifconfig, the eth0 information is not shown anymore as before (only the lo information is shown). Running lspci, the controller is recognized as shown in the following line:

00:19.0 Ethernet controller: Intel Corporation 82567V-2 Gigabit Network Connection

The network adapter is the one that comes onboard, I have an Asus Rampage III Extreme motherboard.

Trying to get Internet from somewhere, I plugged a PCI wireless card in the motherboard and it was recognized by Ubuntu, so I had Internet, but after using it for 10 minutes, the connection went down and now it doesn't recognize any wireless networks (it says wireless: unavailable), so I cannot connect either wired or wireless. I have tried flashing the BIOS to a newer version and a bunch of different solutions I read in forums but still with no luck.

The strange thing is that if I boot with Windows 7 (I have double boot with grub), both cards are correctly recognized and I can have Internet wired and wireless, so a hardware problem is discarded.

Any ideas? This happened out of the blue for me, because I hadn't made any system updates nor installed any new software when the network adapter went down.

Edit: booting with Ubuntu CD doesn't solve the problem either.. I still have the same problem mentioned above