13.04 gives me this:
sudo lshw -C network
*-network DISABLED
description: Ethernet interface
product: RTL8111/8168 PCI Express Gigabit Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.

12.04 this:
lshw -C network
WARNING: you should run this program as super-user.
*-network
description: Ethernet interface
product: RTL8111/8168B PCI Express Gigabit Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.

8168 vs. 8168B...any significance here?