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Re: Unable to boot after moving partition

From: Simon Hobson
Subject: Re: Unable to boot after moving partition
Date: Fri, 18 Oct 2013 16:56:38 +0100

Chris Jones wrote:
>I had to move a partion using gparted to make room for something else
>and I am no longer able to boot that system.
>I get the following error messages:
>| error no such device c07cc7e9-1c06-47fe-99b6-16c5145fbc4f
>| error HD1 cannot get C/H/S values
>| error you need to load the kernel first

I'm no expert, just an admin with plenty of scars from this sort of thing 
biting me in the backside !

My *guess* is that Grub does some operations by blocklist - so if the files 
move then Grub can no longer load parts of stuff it needs. Part of the software 
may be written in the gap between partition table and the start of the first 
partition which could well have been mangled while you were moving stuff, or it 
may be in a small partition set aside for this, the rest will be in your boot 
partition, which you've moved.

What I generally do in these situations is boot the system from a live CD - the 
closer in software terms to the system the better. For Debian, current 
installers include a live option which means you're booting from somthing very 
similar which makes life simpler.

If you cannot see the issue, then you can repair Grub from the Live CD with 
something like this (I take no credit for this, it was advice given to me in a 
different forum IIRC) :
 mkdir /sysroot
 mount /dev/your-root-dev /sysroot
 mount /dev/your-boot-dev /sysroot/boot
 mount --bind /dev /sysroot/dev
 mount --bind /sys /sysroot/sys
 mount --bind /proc /sysroot/proc
 mount --bind /run /sysroot/run (recommended if you are using systemd)
 chroot /sysroot
 grub-install /dev/your-grub-boot-device (may be grub2-install on some distro)

Alternatively, it can be helpful to learn the basics of Grub command line.
Going from fuzzy memory, if you get to the command line at boot time, then you 
can manually set root and load a kernel. Once you get the system booted once, 
you can then do a grub-install. I've had this before while swapping disks out - 
and failed to correctly set some option or other (though I usually use the 
"Edit" option at the Grub menu rather than teh Grub command line).

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