Low graphics mode when installing 12.04 from a live CD

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http://askubuntu.com – I have a PPC G4 tower with XCLAIM VR RAGE 128 PRO PCI DVI MAC, Microsoft mouse and a Crywolf Coolmac silicone keyboard. I was able to live boot from the CD. Turned the computer on and it live booted. I got an error message saying it was running in low graphics mode because it could not recognize the graphics card or the other input devices. I am a novice and don't know what the next step should be. I have read what I can find but I need very specific instructions. (HowTos)