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Thanks, I hope it proves useful.

I honestly have not tried to install Debian, but aside from any slight differences in the installation process, I'd expect it to be pretty much the same as Ubuntu (assuming it uses Yaboot for multi-boot).

It's mainly just about generating, then altering, yaboot and associated files to ensure that all OSes are bootable.

I went round in circles a few times because I wanted my MorphOS boot partition to show up as "apple_bootstrap" rather than "HFS" (took a bit of jiggling, almost ended up with no bootable OS at one point), but that's not in any way necessary (I just wanted it that way ).