@Colin,
I don't really understand enough about what you are trying to accomplish... is 
it that you have to update the wubildr? I ask because I've never seen wubildr 
updated by a grub-pc update on any wubi install I've had, despite the fact that 
grub-install has the ability to do this.

If the problem is that you need to find /host/wubildr to identify a wubi 
install, why don't you instead use /host/ubuntu/winboot/wubildr because this is 
always present on any wubi install - i.e. change 
/usr/share/lupin-support/grub-mkimage
Note if you do need to update wubildr it could always update the /winboot copy 
if there is no /host/wubildr and then just prompt a user to boot into windows 
and copy \ubuntu\winboot\wubildr to c:\wubildr. It's a bit cheesy, but it's 
better than leaving a wubi install broken. The only alternative would be to 
iterate through all partitions and mount and update any /wubildr it finds - but 
this might be considered too invasive.

-- 
Can't boot Ubuntu after an upgrade from 10.04.1 to 10.10
https://bugs.launchpad.net/bugs/653134
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