This looks like the "usual" problem where ubiquity doesn't work out that the HFS partition should be used as a bootstrap partition.
** Bug 59248 has been marked a duplicate of this bug
** Changed in: ubiquity (Ubuntu)
Importance: Untriaged => High
Status: Unconfirmed => Confirmed
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Mac Power PC Installer failed writing boot loader
https://launchpad.net/bugs/58688
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