How to propery burn a disk image for Kubuntu

I downloaded and burned a live cd of kubuntu and when i start up, nothing happens. (I am holding "c")
After going into sys pref > startup disks I see that the cd does not even show up! Mabey the problem is in buring the disk.
I open disk utility, select the iso of the live cd on the left, then hit burn in the toolbar. Then i hit burn again. Mabey i have to do something different to make it a bootable image?

Acorn,
I think you refer to Ubuntu Linux - from www.ubuntu.com, currently Version 5.10 ?
You are right, the machine should start from the CD when you turn on the computer and hold the "c" key, or, if you hold the "alt" key, the mac should give you the option to start from the CD.
What sounds strange in your explanation:
"I open disk utility, select the iso of the live cd on the left, then hit burn in the toolbar......"
If you downloaded the .iso image, then, open disk utility, disk utility cannot have any knowledge of the ubuntu CD. Its unlikely that the cd will appear in the left toolbar.
This can only happen, if you first mounted the image using disk utility.
Burning the CD this way is not recommended.
Even opening/mounting the image might damage the image (but very unlikely)
If this has happend,unmount the image, maybe redownload the .iso image.
Then, open disk utility, navigate to the "images" menu, click "burn".
In the open dialog of the finder, find the .iso image, select it and burn.
That way you should get a bootable CD.
I hope, this helps, if not, post back the specs of your machine, or lookup on the ubuntu site if it is supported by ubuntu.

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