[ubuntu] powerbook g4 17" not running my 12.04 ppc live disc.

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http://ubuntuforums.org – well after looking at a powerbook g4 that was on a shelf i decided i might try to run ubuntu off of the live disk just to see how well it works, but i was stopped because it never goes past the black ubuntu 12.04 screen it freezes and i have to reboot the computer. so what i am wondering is ........ is 12.04 even compatible with the ppc cpu? i got the .iso from here http://cdimage.ubuntu.com/releases/precise/release/ and i did the desktop cd Thanks ahead of time, Boneskid1 (Hardware)