Is there a known issue with ubuntu-8.04-desktop-powerpc.iso? I downloaded it twice, on two different Macs [one by Torrent, one directly]. In both cases, after the download completes i get this when i attempt to mount the disk image: "The disk image you are opening may be damaged and could damage your system." I am using Disk Utility 10.5.6 on Tiger.
Edit: to be perfectly clear, i also downloaded and burnt the amd64 iso on my Mac - no scary warnings there.