Install Lubuntu 13.04 on PowerBook G4 17" (REV D? 2005)

Get ISO from here

http://cdimage.ubuntu.com/lubuntu/releases/raring/release/lubuntu-13.04-desktop-powerpc.iso

Boot ISO (Option-C) when power on or 'c' if yaboot is already installed.

At the boot: prompt type:

live video=radeonfb:1024x768-32@60 

https://help.ubuntu.com/community/Lubuntu/Documentation/FAQ/PPC

Install!