Grub disk: something automatic?

[Tom H]

> Allright, I keed,, if installing grub2 to the superblock of a partition
> is a bad idea, can someone provide more info on why?  I think the MBR is
> far too often treated as public property that any OS and it's brother
> feel free to screw up to be a reliable place for a Multi-OS GRUB install.

No idea. "grub-install /dev/sdaX" fails with an error message but I
have forgotten what it is.