Good news people, :--D
I have succesfully activated the apple airport extreme in ubuntu 6.06 dapper ppc.
Here is how,
Taken from http://ubuntuforums.org/showthread.php?t=197102
Dapper Confirmed Working!!! - Feisty (as of yet untested)
To use the native bcm43xx driver:
and double click it to install. Reboot. Enjoy wireless. (this should work, but if for some reason it fails, see the troubleshooting)
This was tested on an iBook G4, 1.4 ghz, 512 ram, 60 gig hd, 12' screen.
Please post this information on various linux forums for others to enjoy. :--D