Hi,

I got my system up and running.

It was a problem with the efi boot details. I had installed the latest
kernel (not manually) and that install process somehow messed up the efi
boot as it existed. After boot was broken, the console would show what it
was going to boot but the xen never loaded. Now it does.

Thank you donoban, Bernhard, and Jinoh for the right pointers.

I have made a list of steps that helped me gauge the situation. I will post
it within a few hours.

Regards,
Ranjeet

On Wed, Feb 10, 2021, 8:21 AM Jinoh Kang <jinoh.kang...@gmail.com> wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> On 2/10/21 3:05 AM, Ranjeet Shetye wrote:
> > Hi,
> >
> > Is there a standard HOWTO I can follow to fix the boot process (to go
> from a grub / xen.cfg that fails to LUKS decrypt and load unencrypted
> rootfs)
> >
> > I am reasonably knowledgeable about Linux. Gaps exist in my knowledge
> regarding BIOS and UEFI boot processes.
> >
> > Unfortunately the grub update for the kernel upgrade seems to have
> messed up the boot process. How do I figure out if it's installed for BIOS
> or UEFI mode ?
> >
> > My data is safe and LUKS encrypted . I can use a live USB to decrypt it,
> access it and I also have made 2 backup copies.
> >
> > So with nothing to lose I tried to fix the boot manually from a live USB
> including creating /etc/default/grub but situation is no better.
> >
> > Between BIOS / (UEFI) / grub2 / xen / vmlinuz / LUKS / LVM2 , I am lost
> where the fix might be. Might be grub flags, grub modules, grub defaults,
> xen cfg, EFI manager etc. Hence my question.
> >
> > Thanks,
> > Ranjeet
>
> Also note that Qubes R4.0 on UEFI does not boot via GRUB -- it boots
> directly via \EFI\qubes\xen.efi.
>
> - --
> Sincerely,
> Jinoh Kang
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