Comment 6 for bug 687501

I had first thought that it was the package installation order of multipath-tools/boot
and the post configuration that sometimes resulted in an unbootable system was user
error, this is not the case. It's in fact another bug, with update-grub, which ruins
the grub.cfg when we're actually using MP devices for our root.

https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/688261

So basically, the next time the kernel is updated or the user changes
the grub args will result in a brick.