how to integrate an old installation in Grub and startmenu

[Liam Proven]

On Wed, 8 Sept 2021 at 18:48, Lentes, Bernd
<bernd.lentes at helmholtz-muenchen.de> wrote:
>
> Hi,
>
> i just installed a fresh 20.04 Server. Inside the box, on another hd, there is an old 16.04 installation
> we ocassionally need to boot.
> But the 16.04 is not integrated in /boot/grub/grub.cfg.
> Neither i have /etc/default/grub nor files in /etc/grub.d
>
> How can i integrate the old installation in Grub ?

Mount the old installation's drives _first_, then run `update-grub`.

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