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

[Richard Owlett <rowlett@cloud85.net>]

On 04/12/2017 01:49 PM, songbird wrote:
> Pascal Hambourg wrote:
> > Le 12/04/2017 à 17:14, Richard Owlett a écrit :
> > > Whether initiated after power-on OR a restart the observed sequence is:
> > > 1. Appearance of the Grub2 menu with a choice of 4 instances of Debian.
> > > 2. Select instance installed on the SD card.
> > > 3. Screen clears, this message appears against the Debian 8 background.
> > >    error:  no such device: 380e2a6d-f851-4fd1-9db2-869a0982b511.
> > >    Press any key to continue ...
> > > 4. Otherwise the instance of Debian on the SD card boots routinely.
> >
> > This is a GRUB error message which cannot find the UUID specified in a
> > "search" command.
> >
> > In order to investigate, can you
> > - report the menu entry code for the SD card system in
> > /boot/grub/grub.cfg (the one from the system on the hard drive owning
> > GRUB, not the one on the SD card) ;
>
>   yep!
>
>
> > - while the SD card is inserted, in the GRUB menu press "c" to enter a
> > GRUB shell and report the result of the "ls" command.
>
>   also, check that the mount points exist for
> the file system.
>
>   you may think you've installed things to one
> location only to later find you've actually
> put them someplace else...

I do not understand those 2 questions.
Gparted displays what I expect to see.
All partitions are mountable using the "Places" menu on MATE's panel.


>   another thing you can do is construct your own
> menu entry and put it in /etc/grub.d/40_custom file

I don't see that being informative for this problem.

> here is an example from when i was playing around
> last week (you may need to insmod something else(s)
> to get the efi, ssd, ext4, whatever partition table
> type you use, etc. going):  [and only use the lines from
> between the ====='s]  adjust as needed/desired.  :)
>
> oh and of course, check your partition tables on the
> devices to make sure they're actually what you expect.

???
See comment re your 1st 2 questions.



> ======
> #!/bin/sh
> exec tail -n +3 $0
> # This file provides an easy way to add custom menu entries.  Simply type the
> # menu entries you want to add after this comment.  Be careful not to change
> # the 'exec tail' line above.
>
> menuentry "Count to three before launching..." {
>
> echo "1..."
> sleep 1
> echo "2..."
> sleep 1
> echo "3..."
> sleep 1
>
> set linux_gfx_mode=
> export linux_gfx_mode
> load_video
> insmod gzio
> insmod part_msdos
> insmod ext2
> insmod usb
> insmod fat
>
> set root='hd0,msdos1'
>
> echo    'Loading Linux 4.9.0-1-686-pae ...'
> linux   /boot/vmlinuz-4.9.0-1-686-pae ro root=LABEL=ROOT_007
> echo    'Loading initial ramdisk ...'
> initrd  /boot/initrd.img-4.9.0-1-686-pae
> }
> ======
>
>   and then run update-grub to get your new menu.
>
>
>   songbird