I recently received a old PowerMac G5. I updated its Mac OS operating system to 10.5.8. I dabbled with Ubuntu with my MacBook and I really liked the experience. I'm trying to find the best version of Ubuntu to install on my PowerMac. I'm also, looking for more precise instructions. Most of the info that I have found is only relevant to Intel-based Apple computers. Thanks!
I think from the the supported hardware page the current LTS, 12.04 should be fine. It says "NewWorld" architecture is supported for the Power Macintosh G5.