Answers: Hi. Yes, you are contained by luck! You can download a copy of Ubuntu 6.10. I've included the join for the PowerPC publication download below.
You can download the Ubuntu 6.10 .ISO here.
http://old-releases.ubuntu.com/releases/...
If you hold an Intel base Mac, you can newly download the regular PC performance, x86 if you enjoy a single core Windows gadget or x64 is you hold a dual-core system.
The most recent performance of Ubuntu, 7.10, WILL RUN on Intel base Macs, but NOT Power PC Macs. You can win the most recent newspaper of Ubuntu from www.ubuntu.com
Use the Disk Utility on OS X to burn the .ISO to a blank disc.
OS X is Linux, freeBSD, essentially.
You could also use Boot Camp to install other Linux Distros.