[PPC] ubuntu install on powerbook g4 titanium

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http://ubuntuforums.org – Hi, I'm trying to install ubuntu 10.10 for PPC on my old powerbook g4 titanium 400mhz(Powerbook3,2). After booting the ubuntu from cd drive and get "boot" prompt, I press return then I only see black screen changing color from white screen. (something wired on the screen) I also tried lubuntu 12.04 to the same machine. I got same "boot:" prompt and pressed return key and after a few minutes, I only get unix prompt "lubuntu@lubuntu" (looks like live boot. I can type unix command here). Does anyone know how to get to "install menu"? (Hardware)