You can't just go home "sick"???? Just kidding!
When you get home, try doing
When you added the CD as a source, the system has not done an update to see what your CD has.
sudo apt-get update
If that doesn't work, then post your /etc/apt/sources.list. Do you have a wired internet connection in Ubuntu? If not, then posting this information might not be so fun. What we are looking for is something like this:
It won't be exactly like this because I am using Kubuntu and installed mine while Hardy was in the alpha status.
deb cdrom:[Kubuntu 8.04 _Hardy Heron_ - Alpha amd64 (20080201)]/ hardy main restricted