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I have also encountered this problem. My PC contains an Asus P7P55D Pro motherboard with an integrated Realtek 8111/8168B PCi Express Gigabit Ethernet Controller. I have a dual boot setup with Windows 7 Ultimate 64-bit and Ubuntu.
When I first built the PC, I installed Ubuntu 9.10 and everything seemed fine. I subsequently upgraded to 10.04 and the network was still usable at first. One day, I booted Ubuntu and the wired network was shown as not connected; there was no link light on the PC or switch either. The same patch cable/switch port worked fine for another PC. I rebooted the P7P55D PC into Windows and still had no network connection. I switched off the computer (unplugged mains) then restarted and Windows worked fine again. Booting back into Ubuntu made the problem recur.
I fitted a spare Intel 82557 PCI card and updated to Ubuntu 10.10 using this network interface. Unfortunately the problem with the Realtek interface is unchanged...