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 -- Mac Power PC Installer failed writing boot loader https://launchpad.net/bugs/58688 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs