Comment 2 for bug 40973

Update: The install CDs failed several additional attempts, too, so I resorted to reinstalling Breezy, then upgrading to Dapper Beta through the update manager. That worked on the clamshell iBook. It took several hours, but it did work. I'm now testing Dapper on that machine and will report any additional bugs in separate threads.

As this problem seems to affect the dual-USB model as well (see Jorge's comment), this should probably be upgraded to an "urgent" bug. G3 iBooks are very popular, and they have just reached the end of their Apple upgrades, so they're excellent candidates for Ubuntu.