The Debian Installer menu item "Load installer components from CD" is the step that fails. The user interface message is not helpful as it says "Failed to load installer component Loading partman-base failed for unkown reasons. Aborting."
Today I tried downloading the debian-update-8.2.0-powerpc-DVD-1.iso and burning the DVD. I had hoped that this was an update to correct this error in the Debian Installer but once I mounted the DVD in Mac OS X I saw that it does not even contain the installer! I was looking forward to deploying Debian on this iMac as a simpler exercise like I have experienced in deploying Debian on several i386 machines in the past. I'd love to start hacking on the install image boot configuration, and whatever else contributes to this failure. Can anyone spare a moment to give me a pointer to where the source is for this and instructions for building an install image? Sincerely, Richard