For more information on where to get CDs, see the section called “Official Ubuntu CD-ROMs”.
Some installation methods require other images than CD images. the section called “Where to Find Installation Images” explains how to find images on Ubuntu mirrors.
The subsections below will give the details about which images you should get for each possible means of installation.
Download the image for your architecture and burn it to a CD. To boot a PowerMac from CD, press the c key while booting. See the section called “Booting from a CD-ROM” for other ways to boot from CD.