Please inidicate which version of live-build you are using.
Please also retry with a minimal configuration (in a fresh directory):
It looks to me like live-installer does not yet work on powerpc. I can't
lb config --debian-installer live
confirm as I don't have a powerpc system for testing. This minimal test
will help determine if that's the case or not.
To UNSUBSCRIBE, email to email@example.com
with a subject of "unsubscribe". Trouble? Contact firstname.lastname@example.org
Archive: 4DAC4AAD.email@example.com" target="_blank">http://lists.debian.org/4DAC4AAD.firstname.lastname@example.org