[PPC] Ubuntu on PowerPC iBook G4

Hello,

I have a iBook G4 that I have recently received.

I heard that I can put Ubuntu on it but I am unsure of how to go about doing so.
I currently have OSX 10.5.8 installed on the machine, but I have decided that Ubuntu would be the right way to go.

I have tried live booting an ISO that I downloaded from a website, but when I booted it, It just showed BusyBox and froze.

Any way I can get this thing running?

Machine details:
iBook G4 14 inch
PowerPC G4 processor 1.42 GHz
512 MB internal RAM
256 MB added RAM
60 GB internal HDD
CD + DVD RW Slot loading drive

Thanks in advance for any help!