The Asus P5G41T-M LX3 is a Micro-ATX mainboard with Intel G41 chipset.
The on-board Gigabit-Ethernet chipset
02:00.0 Ethernet controller : Atheros Communications Device [1969:1083] (rev c0)
can cause troubles on outdated distributions (e.g.. Ubuntu 10.04) and is not recognized out of the box by the kernel modul atl1e in these distributions:
*-network UNCLAIMED description: Ethernet controller product: Atheros Communications vendor: Atheros Communications physical id: 0 bus info: pci@0000:02:00.0 version: c0 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress vpd bus_master cap_list configuration: latency=0 resources: memory:febc0000-febfffff ioport:ec00(size=128)
However, in latest distributions a new version of the modul atl1c is used which fully supports this chipset: http://www.linuxfoundation.org/collaborate/workgroups/networking/alx.