Getting There - The Summary
Ok, it seemed like at last I was getting somewhere and had successfully managed to image the iBook. I meant to add another bookmark, that I found useful from the Ubuntu website directly.
Here’s the actual list of commands I ran after ensuring the target disk (the iBook) was formatted correctly as Apple Partition Map in Disk Utility
Prepare downloaded Lubuntu image to img format
hdiutil convert -format Rdxx -o /Users/admin/Desktop/lubuntu.img /Users/admin/Desktop/lubuntu-14.04.4-desktop-powerpc.iso
Get a list of volumes
diskutil list
Unmount iBook volume
diskutil unmountDisk /dev/disk3
Image iBook volume with Lubuntu
sudo dd if=/Users/admin/Desktop/ubuntu.img of=/dev/rdisk3s3 bs=1m
Eject iBook Disk
diskutil eject /dev/disk3
This all works and the iBook does indeed boot into Lubuntu…