Spits out install CD

[Faud]

Hello,
I have a Powerbook G4 with nothing on the hard drive. I wanted to put Linux on it so downloaded from https://wiki.ubuntu.com/PowerPCDownloads
I put the disk in, start up and then hit C at the boot sound. I have also tried del-shift-command-option. Either way I try the computer just spits out the dvd.
As said above the mac does not have a current operating system for me to boot into and try the CD that way. I have burned the CD at low levels and have tried different CDs.
We tried a MAC install CD and that did work, but since the it was not a G4 install CD the install would not finish.
Does anyone have any suggestions?
I can use the MAC install CD to at least get to a terminal if that is necessary but do not know how much I would be able to do in there.

[llamabr]

Did you only try 12.04? Maybe try an older distro. It should not be much more work to get it updated, after you have the core installed.

[Faud]

Hi,

We also tried 10.10 as well as the instructions here:
http://ubuntuforums.org/showthread.php?t=1986485

but it keep spitting out the Linux discs.

[Faud]

If I boot holding down the option button it will find the MAC disc but it never finds an Ubuntu disc if that helps.

[Faud]

So all of this headache and it turns out that the powerbook G4 cannot read a DVD -R, it booted just fine off a CD. *sigh*

Thanks yall