On 2018-06-10 10:08, Renaud (Ron) OLGIATI wrote:
> A work-around for your problem:
>
> Install each OS individually on a HD (disconnecting the other bootable
> ones if need be) and install Grub on the mbr of that HD.
>
> When booting, press F8 (or whichever your BIOS uses) to bring up the
> Boot Menu, and choose there the HD you want to boot from.
>
> Cheers,
>
> Ron.

I have done exactly that more than once. No chance of an 'oops' when
only one disk is available for install. Just make sure it's the disk
you want to write to.

golinux