Re: Boot setup question

On Fri, Sep 14, 2018 at 3:21 PM o1bigtenor <[email protected]> wrote:

> On Fri, Sep 14, 2018 at 2:02 PM, gregrwm <[email protected]> wrote:
> >> There are 20+ partitions on the hard disk so both systems have
> everything
> >> separate except /boot and /efi (whatever that partition is called).
> >
> > so boot is shared?  if so, eek.  apt-get update on one will throw out
> > kernels still expected by the other.  and similar ugly contention for
> > maintaining grub.  this would explain why grub couldn't find the other
> OS.
>
> OK that's why I've not been  able to get this working!
>
> >> advises that users do not directly edit grub.conf, and use their own
> >> "discovery" and mangement
> >> of GRUB scripts.
> >>
> >> But I always tweak the grub.conf myself.
> >
> > grub.conf is regenerated, and your mods lost, whenever a new kernel is
> > installed.  i know, i hated it when i first started learning grub2.  your
> > mods belong in /etc/default/grub and /etc/grub.d/40_custom.  copy
> 40_custom
> > to 07_custom and stuff in there will precede, and thus be what boots by
> > default.  put in there entries which boot via the kernel and initrd in /,
> > those softlinks are updated whenever a new kernel is installed.  then
> either
> > regenerate grub.conf, or i confess i then edit the same mods into
> grub.conf
> > as well, it's just plain far quicker.
> >
> > also if you're interested in how to boot multiple installs all from the
> same
> > partition, just ask.
>
> Bingo - -- - I've been looking for this and can't find any guides nor
> ideas - - -
> so - - - please? (Supplicatory posture entered! (grin!))
>
> Dee


just tripped across this, looks like i never answered?  it's here:
https://unix.stackexchange.com/a/441385/98978

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