Attached is a patch to the lupin-support package which should prevent
grub-install.real from being used on wubi systems where wubi was
installed to a disk other than "C:" . Instead on upgrades users with
such a configuration will be warned that grub failed to install.

This is not a complete fix, and users with such a config will still
eventually run into problems booting *Ubuntu* due to the core.img and
modules never being updated to match incompatible updates to their
grub.cfg . But their mbr won't be overwritten with a broken grub
install, so they won't be prevented from booting Windows.

I have ideas for a complete fix but due to the seriousness of this bug
(I'm seeing on average 1 person per day with an unbootable machine due
to this bug in #ubuntu and #grub on irc.freenode.net alone) I think a
simple patch that can more easily get an SRU and fixes the most critical
aspect is important first.

** Patch added: "lupin_grub-mkimage.patch"
   
https://bugs.launchpad.net/ubuntu/+source/lupin/+bug/610898/+attachment/1748479/+files/lupin_grub-mkimage.patch

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grub-pc upgrade renders computer unbootable when Wubi is installed to partition 
other than Windows
https://bugs.launchpad.net/bugs/610898
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