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Re: Fixing a Grub Foul-up

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You might be running in to the problem that the blkid that is expected 
may be changed during boot. As I am running into a similar problem on a 
system I upgraded to buster from stretch, this link might help:

https://www.thegeekdiary.com/inconsistent-device-names-across-reboot-cause-mount-failure-or-incorrect-mount-in-linux/

On 2020-11-16 1:48 p.m., Martin McCormick wrote:
> I have goofed, I think.  There is a serca-2000-vintage Dell
> Optiplex that has been working fine up to yesterday when I did
> the usual apt-get update followed by the apt-get upgrade on
> buster.  The update and upgrade appeared to work.
>
> 	One of the things that got visited was grub and it was
> then that I was reminded that there was another drive in the
> system that had a bootable image of buster on it also.  Grub
> reported seeing it on /dev/sdc which is coorrect.
>
> 	This particular system has a zip drive that always shows
> up as /dev/sdb so the next hard drive after /dev/sda is /dev/sdc.
>
> 	I rebooted to make sure all was well and waited and
> waited . . .
>
> 	The system sits there like a bump on a log.
>
> 	I have a usb device that lets one mount IDE and SATA
> drives that are outside the system so I pulled the sata drive
> which is the boot drive for the now dead system and plugged it in
> to the usb converter.
>
> 	the drive breezes through fsck and looks perfectly
> normal.
>
> 	I looked at /boot/grub/grub.cfg which one is not supposed
> to edit as grub builds it based on /etc/default/grub which one
> does edit.
>
> 	If I was to mount that partition on a working system, it,
> of course, will have a different device number such as /dev/sde1
> instead of /dev/sda1 which it should have when booting up the
> system it normally runs in.
>
> 	Is there a safe way to mount this drive, possibly using
> chroot, re-run grub-config and get the drive bootable again?
>
> 	If I look at grub.cfg and /etc/default/grub, everything
> looks as if it should work but it doesn't.
>
> 	I think boot problems are some of the most agrevating
> issues.  They are true show stoppers.
>
> 	I've got backups but that's beside the point.  Unless I
> can fix whatever happened, it's going to be quite a time waster.
>
> Thanks for any constructive suggestions.
>
> Martin McCormick
>
-- 
Regards,

John Boxall

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Thread

Fixing a Grub Foul-up "Martin McCormick" <martin.m@suddenlink.net> - 2020-11-16 20:00 +0100
  Re: Fixing a Grub Foul-up Dan Ritter <dsr@randomstring.org> - 2020-11-16 20:40 +0100
    Re: Fixing a Grub Foul-up "Martin McCormick" <martin.m@suddenlink.net> - 2020-11-17 04:00 +0100
    Re: Fixing a Grub Foul-up "Martin McCormick" <martin.m@suddenlink.net> - 2020-11-30 05:00 +0100
      Re: Fixing a Grub Foul-up David <bouncingcats@gmail.com> - 2020-12-01 15:40 +0100
        Re: Fixing a Grub Foul-up Solved! "Martin McCormick" <martin.m@suddenlink.net> - 2020-12-01 21:10 +0100
  Re: Fixing a Grub Foul-up John Boxall <jboxall47@gmail.com> - 2020-11-16 20:40 +0100
    Re: Fixing a Grub Foul-up Kenneth Parker <sea7kenp@gmail.com> - 2020-11-17 03:00 +0100
  Re: Fixing a Grub Foul-up David <bouncingcats@gmail.com> - 2020-11-17 00:00 +0100
    Fixing a Grub Foul-up, Not There Yet. "Martin McCormick" <martin.m@suddenlink.net> - 2020-11-21 20:00 +0100
      Re: Fixing a Grub Foul-up, Not There Yet. Felix Miata <mrmazda@earthlink.net> - 2020-11-21 20:40 +0100
        Re: Fixing a Grub Foul-up, Not There Yet. "Martin McCormick" <martin.m@suddenlink.net> - 2020-11-22 00:10 +0100
          Re: Fixing a Grub Foul-up, Not There Yet. Felix Miata <mrmazda@earthlink.net> - 2020-11-22 01:20 +0100
          Re: Fixing a Grub Foul-up, Not There Yet. Kushal Kumaran <kushal@locationd.net> - 2020-11-22 02:10 +0100
      Re: Fixing a Grub Foul-up, Not There Yet. Dan Ritter <dsr@randomstring.org> - 2020-11-22 01:10 +0100
        Re: Fixing a Grub Foul-up, Not There Yet. "Martin McCormick" <martin.m@suddenlink.net> - 2020-11-22 04:50 +0100
      Re: Fixing a Grub Foul-up, Not There Yet. "Martin McCormick" <martin.m@suddenlink.net> - 2020-11-30 18:00 +0100

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