On Tue 15 May 2012 at 00:41:18 +0100, Brian wrote:

> I have replicated your problem (GRUB dropping to a prompt) by running
> the command above from an unstable installation. I've no explanation
> for it apart from some hazy idea GRUB is confused by having its files
> in two places, /boot/grub and /grub, but was able to retrieve a GRUB
> menu with
> 
>    grub-install /dev/sda

Ok, I do have an explanation now!

In your first mail you said:

   > the system boots. once booted I run one of the commands below
   > & reboot
   > update-grub2
   > grub-install --root-directory=/ /dev/sda

update-grub2 runs the command

   grub-mkconfig -o /boot/grub/grub.cfg

and generates a grub2 configuration file in /boot/grub. You then told
GRUB to install its images in /grub but, because you did not generate
a grub.cfg file in that directory, it was unable to display a menu so
came up with a prompt instead. This can be checked by copying grub.cfg
from /boot/grub to /grub or by doing

   grub-mkconfig -o /grub/grub.cfg


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