Comment 6 for bug 688261

The test package is at

ppa:serge-hallyn/grub-multipath

with the code at

lp:~serge-hallyn/ubuntu/lucid/grub2/multipath2

I don't think these changes will be acceptable, but they work for me both on a
system with and without multipath.

Hopefully I can figure out how to teach grub-probe to do the right thing.