Re: Can an iMac 24" with Core2 Duo run Debian AMD64?
Yes it can but you have to install differently. That series of mac has some different 32bit/64 bit EFI type issues. It is best to use a regular non EFI installer to install Linux on it. I had a macbook with the same type of issue. The error you pasted is exactly the same one I encountered when installers started incorporating the EFI installers. I no longer have that hardware so haven't done an install in some time so I can't tell you where/ how to get an installer without EFI enabled. Worst case, you could do a minimal install of an older version and then dist-upgrade to the latest version. You could also do a chroot install from a bootable livecd. You should be able to find an installer with EFI disabled though.