Can you use the the ethernet option for your modem? If so, the driver issue could be a non issue....
you could look into setting up a LAN with a hub or router for your computers
In Linux (Specially the dpkg variety which is Debin/Ubuntu...the place to look is under /etc/network/interfaces. From the main "/" (root folder) find /etc /network is located there.
interfaces is a text file. Here is an applicable snippet of the one my laptop:
What the example does for me is it assigns a static IP address.Next, it sets up my network interface to turn on automatically.
The gateway is my router (which could be a modem if I had less computers).
The bolded items are the ones that you will want to change, the rest of the info can be copied and pasted.
The easiest way of editing this file is from the Gnome, just poke around for folders