Help with content of /etc/network/interfaces file, **progress**

[Tom H]

>> What is the content of
>> /var/lib/dhcp3/dhcpd.leases
>> on your dhcp server?
>
> The content of that file is ONLY the # header comments (7 lines). No other
> information. I think this may be a BIG part of what is going on...

Do you have any dhcp clients with current leases? If yes, from which
dhcp server are they receiving these leases?

The lease(s) are in /var/lib/dhcp3/ on the Ubuntu clients.