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Re: Question about grub in a virtual machine

From: Chris Green
Subject: Re: Question about grub in a virtual machine
Date: Sun, 27 Jun 2021 08:48:07 +0100

On Fri, Jun 25, 2021 at 12:53:51PM +0100, Chris Green wrote:
> I am trying to create a Virtualbox guest from a real physical Windows
> 10 image.
> The initial problem is that the W10 image is from a machine that also
> runs xubuntu Linux and thus the boot sequence is under grub control,
> it's also an EFI machine.
> So, I can get the W10 image off the machine OK and add it into
> Virtualbox, however, since (I assume) it's not an actual 'boot it by
> itself' W10 image it doesn't boot - I just get dropped into the
> 'grub> ' prompt.
> At this point I'm a bit out of my depth but I managed to find some
> information by searching and I did the following at the grub prompt:-
>     insmod chain
>     set root=(hd0,gpt1)
>     chainloader /EFI/Microsoft/Boot/bootmgfw.efi
>     boot
> The Virtualbox image now boots and I get to the login but there's no
> keyboard.  This *may* be a Virtualbox issue but it may also be
> something to do with the above sequence I've entered into grub.  Is it
> likely that the above is all that's needed or would one expect more?
Now resolved, I think I must have done some *other* things to this
image at the grub prompt.

I started with a new copy and did just the above at the grub prompt
and now it works fine.

Sorry for the noise everyone.

While I'm here, the above sequence seems to be remembered somehow as
the next time I start the same Virtualbox image it just boots to W10
with no intervention.  Is grub somehow remembering the above for me or
is it Virtualbox?

Chris Green

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