lo is normal, it is the loopback interface, ignore it.
The fact that you have eth0 and eth0:0 is at least part of the issue. And the fact that you have the internal address assigned to it doesn't help. My first reaction would be to reinstall again as this will likely clear it up. BTW, do connect the internal interface to the switch just to make sure LMCE sees a link, leaving it disconnected later is fine if you don't want an internal network (however you do see to want one anyway!) but leaving it unconnected during installation could potentially confuse matters.
If you don't want to reinstall, then you need to start by removing the eth0:0 subinterface, you should be able to do this by,
sudo ifconfig eth0:0 down
Then run ifconfig -a again. You could then try hitting the swap interfaces button in web admin. The difficulty here is, it is difficult to tell which interface is which. I don't suppose you have any way of telling what the actual MAC address of the PCI card is? Perhaps on the supplied literature? Failing that you could install ethtool
sudo apt-get install ethtool
then
sudo ethtool -i eth0 or eth1
This should list the driver used for that interface and assuming they are different brands you can then tell physically which NIC is associated with eth0 and which with eth1, and thus which physical NIC has which actual MAC address from the ifconfig command. Once you have that, we can force the correct NIC to have the correct ethX name using udev rules.
If you can't do this, then the only other suggestion is manually swapping the cables around (after deleting the subinterface) and rebooting a few times... it may achieve the same result but is somewhat blind!
