how to integrate an old installation in Grub and startmenu

[Liam Proven]

On Thu, 9 Sept 2021 at 20:20, Lentes, Bernd
<bernd.lentes at helmholtz-muenchen.de> wrote:
>
> i booted Ubuntu Server 20.04, mounted the disk with 16.04 under /mnt,
> and did "update-grub". But my grub.cfg in the 20.04 didn't change, there is nothing
> in it for the 16.04 installation.

Hmm. That is odd.

Do you have the `os-prober` program installed? It's usually there by
default but I admit I have not played with Server much recently except
on Raspberry Pi, where this does not really apply. (No GRUB on RasPi.)

I noticed that Pop_OS does not have os-prober installed by default.

It is the tool that looks for other OSes and adds them to the boot menu.


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