On IRC, I suggested:

<cjwatson> if you mean bug 745800, I'm speculating that that might be the 
understood and non-Mac-specific but rather hard bug 733240
<cjwatson> the way to find out is by mounting and unmounting the filesystem it 
fails to find, then running 'sudo update-grub' again and seeing if the other OS 
now appears in /boot/grub/grub.cfg

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https://bugs.launchpad.net/bugs/745800

Title:
  grub-install loses OS in extended partition

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