trying to download the latest Ubuntu for Mac i was wondering if PPC and utilize the 64 bit version
Are you planning on a dual boot or just Ubuntu. I have a G4 I would like to dual boot with a Linux disto. I'm not sure Ubuntu would be the best for me considering the G4 is so old. I had Ubuntu running on windows machine about the same age and it was way to slow. Maybe I'll just wait for a raspberry pi unless a dual boot is easy.
I have Linux Mint (partially updated to debian-unstable) running on my dual 1.8GHz QuickSilver and it is useable (pretty much on the same level as Leopard on such HW maybe even faster in some regards).
So the question is what kind of PPC are we talking about ? I doubt anything much below my top-end G4 will be any fun with any current desktop Linux.
If your have one of the better G5s even some heavier as Ubuntu (Gnome) or Kubuntu (KDE) might be worth a try (assuming you find supported PPC versions).
For those one might even consider useing a 64Bit PPC kernel, but I'm not sure wether those are easily available.....
Linux with a lighweight GUI (Lubuntu,Mint etc) should be o.k. with a 1GHz G4, just don't expect any miracles
G4s aren't 64bit anyway.... and utilize the 64 bit version