I'll help you get to know your new Linux. I will give instructions using the KDE desktop manager, if you only have Gnome, things should generally be in a similar area.
First, go to main menu/system/more_applications and right click on "File Manager - super user mode" and select "Add item to main panel". This will help you get to know the file structure/tree and you can edit files through here also instead of using an editor. Click on the new icon that showed up by the clock and put in your root password, hit enter. A new window shows up, you are now in /root directory which is the root/administrator's home directory, at the top click on the arrow that points up to take you to / which is the root directory for the entire system. Now click on "etc/apt/sources.list" (double click on etc, then double click on apt, then double click on the sources.list file). In here you should have a line for every disc you have similar to this (You'll have Ubuntu):
deb cdrom:[Debian GNU/Linux testing _Etch_ - Official Snapshot amd64 DVD Binary-1 20070216-00:44]/ etch contrib main
If there is a hash mark (#) at the beginning of these lines, remove it and click File/save at the top of the window. If there are no entries similar to the one I posted above, you will need to add your discs as the drivers you need may very well be on the discs. You can close this list now and go to main menu/system/synaptic_package_manager, to add your CD/DVD's to the list, put the one you need to add in the drive and click on "Edit/Add_CD-ROM" at the top of the window and follow instructions, do this for all your discs to add all your available packages to Synaptic. You may have to close and re-open Synaptic after adding all discs to get the packages to show up.
EDIT: First, through Synaptic, install "linux-headers-2.6xxxx" replace xxxx with what is appropriate to match your kernel, to find which kernel you have, type in a terminal:
In my list (I have sources off the internet also), is a package called "ipw3945d and quite a few ipw3945-modules-2.6.xxxx), the xxxx represents different types of kernels that could be installed on my system. These are probably the packages Matir mentioned. If they are present, put a check next to the appropriate ones and click "Apply" at the top, you may be told other packages need to be installed when checking them, click OK. It will tell you which disc to put in the drive and click OK.
If you do not have these packages available, you will need to find them from Ubuntu's site and download them and put them either on a USB flash drive or into a shared partition between Windows and Linux and navigate to that directory via command line to install them.
If you put the packages on a flash drive, plug it in and wait for KDE to show a pop up asking what to do, click OK to have the flash drive mounted and then close the window (file browser) that appears, or leave it open, not a big deal. Open a terminal and change directory to it with command similar to this, NOTE: use the Super User file manager created earlier to see where it is, it should be in /media:
The xxxx are the name of your flash drive (case sensitive), click enter. Now to install the ipw3945d package use this command (using your actual packages name):
sudo dpkg -i ipw3945d
Hit enter and enter your root password and hopefully it will install, it may tell you it can't because of failed dependencies, you have to install those dependencies it lists first, check to see if they are available in Synaptic, if not, download them also and install with similar command as above.
Apt-get and aptitude install from the sources.list, aptitiude is better, dpkg installs individual packages in the directory you are in or the directory you define in the command. Here is a link to apt-get How to:
Hope this helps.