Please do tell somebody on the Apple forum if you think the instructions are unclear or are missing something, but it would be great if you could make the improvement yourself! All the information you need for a successful install should be in those pages, so make sure you check them out first before wasting your time and effort on needless internet searches. Please review the PowerPC FAQ and the PowerPC Known Issues pages before installing. Below you'll find links to the ISOs on the main Ubuntu server, as well as, help on finding mirrors. Since 7.04 Ubuntu, PowerPC downloads of Ubuntu are not available on all Ubuntu mirrors.