how to integrate an old installation in Grub and startmenu

[Liam Proven]

On Mon, 13 Sept 2021 at 12:30, Lentes, Bernd
<bernd.lentes at helmholtz-muenchen.de> wrote:
>
> Yes. I think that comes from the fact that the PV and VG has been created with Ubuntu 16.04,
> but the os-prober is started from 20.04, so PV and VG are old for him.
> I don't think that this is related with my problem.

I do not *know* but I think they might be.

Your modern GRUB must be able to "see" into your old OS's /boot and
root filesystems in order to boot what is in them.


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