Re: New Grub2 verses Debian 9.5 -boots slow and strange?

[Pascal Hambourg]

Le 20/10/2018 à 16:26, Richard Owlett a écrit :
> On 10/20/2018 09:10 AM, Pascal Hambourg wrote:
> > Le 20/10/2018 à 15:10, Richard Owlett a écrit :
> > > I experiment multiple configurations on my machine.
> > > For my use case the Debian installer has two annoying "features".
> > (...)
> > > 1. If installer installs grub to boot partition it always gives priority
> > >     to the most recent install. *NOT* desirable when experimenting ;}
> >
> > What do you mean by "install grub to boot partition" ?
>
> Wrong word.
> I forget the installer's phrasing. But there is a point where it asks 
> permission to install to a default location on the primary hard disk.

Do you mean the disk boot sector, aka MBR ? Don't do this when doing a 
temporary test installation.

If you let each new installation write its own GRUB instance into the 
MBR, of course this will overwrite the existing one present in that same 
location. Running update-grub from the main installation will not 
reinstall the main installation GRUB instance as the primary boot loader 
and will not change the boot order. You need to run grub-install for this.