Problem booting anaconda for preupgrade (F16 -> F17)

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http://forums.fedoraforum.org – My PC is dual-boot, F16 and Ubuntu 12.04. Although I mainly run Fedora, Ubuntu's grub2 was automatically placed in my MBR when I did the upgrade from Ubuntu 11.10 to 12.04. I recently ran preupgrade to upgrade from F16 to F17. When I tried to boot anaconda, the only Fedora entry in my grub2 menu was "Upgrade to Fedora 16 (Verne)". Prior to preupgrade, there were six Fedora 16 entries in my grub2 menu. (After running preupgrade I ran update-grub on Ubuntu to make sure I got the Fedora changes in my grub2 menu). It appears that grub2 os-prober does not correctly support Fedora's (HowTos)