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Re: Possibly erroneous "device not present" message during boot

On Sat 15 Apr 2017 at 11:35:14 -0500, Richard Owlett wrote:

> On 04/14/2017 01:19 PM, Brian wrote:
> >[snip]
> >
> >> 2. I only install Grub the *first* time I do a Debian install.
> >>    By poor design Grub puts the current install first on menu.
> >>    When experimenting with configuration as I do, the least
> >>    likely install to be functional is the latest.
> >>    This requires me to run update-grub on the "good" install.
> >
> >That's ok. I tend to be more promiscuous; usually on a whim, like
> >wanting to put a particular entry at the top of GRUB's menu list.
> >
> >When you do 'update-grub' do you still get no "set root=" line for the
> >SD card in the grub.cfg?
> >[snip]
> I don't know how many times I've *MIS*read that last sentence ;<
> Mentally I was correcting non-existent typos, thus totally garbling it.
> I just spent several hours wandering thru grub files and loosely related
> documentation.
> I've ended up at
> www.gnu.org/software/grub/manual/grub.html#Multi_002dboot-manual-config
> which says "Currently autogenerating config files for multi-boot
> environments depends on os-prober and has several shortcomings. ..."
> I also discovered there that placing a customized grub in its own partition
> is not only possible, but recommended in some situations. I had read
> somewhere that that option had expired with grub-legacy. That, although
> taking much time to understand, will solve a *MESS* of grub problems for me
> ;/

Treading GRUB's byways isn't for me today. Your only problem as far as I
am concerned is the one expressed in your first post. Even that is of no
great consequence and the visibilty of the message is easily dealt with
in a custom GRUB stanza. Adopt the pragmatic approach.