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Ubuntu recognized by os-prober but not grub

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http://askubuntu.com – I am dual-booting Windows 7 and Ubuntu 12.04. I reduced my Windows 7 partition and increased my Ubuntu partition using gparted from a 12.04 live CD. Everything was fine for about a week. Then the other day I booted and was met with "grub rescue." I purged and re-installed both grub and then grub2 as per the many tutorials on line, but all efforts have met with the same results: It seems that os-prober sees my 2 Windows 7 (actual and restore) partitions, as well as the Ubuntu 12.04 LTS partition; but when I run any variant of update-grub or update-grub2, it only detects the 2 Windows 7 par (HowTos)