Comment 12 for bug 746313

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Colin Watson (cjwatson) wrote : Re: grub fails in ubuntu install on mac with 'guided resize' of partitions

Wow, this is pretty bad. Thanks for the detailed logs.

What's happening here is that partman creates a new BIOS Boot Partition rather than reusing the existing one; and for reasons best known to itself it also changes the existing BBP to not be a BBP any more. The effect of all this monkey business is that GRUB no longer manages to recognise the disk as GPT, and things go south pretty rapidly from there.

partman really ought to reuse the existing BBP. This is sadly not entirely trivial to arrange, so I probably won't manage to do it in time for beta-2, but it should be possible.