how to integrate an old installation in Grub and startmenu

[Lentes, Bernd]

Hi Liam,

what do you mean by “first” ?

Bernd Lentes

> Am 08.09.2021 um 22:45 schrieb Liam Proven <lproven at gmail.com>:
> 
> 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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