Moral - use the latest version of Ubuntu (12.04) . It has the additional advantage of long-term support. Or you could install software from the Internet rather than the CD - probably a good idea as CD versions will probably need an immediate update.
At the time of its release Distrowatch said of 11.04:
"I'm of the opinion there are good features in this release, but 11.04 definitely suffered from being rushed out the door while it was still beta quality. Ubuntu aims to be novice-friendly, but this release is buggy and I think they missed the mark this time around. I'm limiting my recommendation of 11.04 to people who want to play with an early release of Unity."
I doubt much attention is being paid to minor bugs in this old version of Ubuntu. Do yourself a favour and install 12.04, which has Long Term Support. Why the reluctance?