‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Thursday, March 4, 2021 8:10 PM, tito via Dng <dng@???> wrote:

> On Thu, 4 Mar 2021 17:22:42 +0100
> viverna viverna@??? wrote:
>

> > Yesterday I updated one of my computers with apt-get upgrade. This
> > packages are upgraded:
> > grub-common grub-pc grub-pc-bin grub2-common
> > dpkg install from version 2.02+dfsg1-20+deb10u3 to version
> > 2.02+dfsg1-20+deb10u4
> > 2.02+dfsg1-20+deb10u4 seems came from to:
> > http://deb.devuan.org/merged beowulf-security/main
> > 2.02+dfsg1-20+deb10u3 is in:
> > http://deb.devuan.org/merged beowulf/main
> > Upgrading system does not produce or show any problems and then I
> > halt the system.
> > I use Devuan Beowulf for all my pc. In this computer there is only 1
> > hd, partition type gpt, 3 partitions:
> > /dev/sda1 EFI System
> > /dev/sda2 Linux filesystem
> > /dev/sda3 Linux swap
> > I switched on the pc later and grub rescue appears. WTF?
> > I solved (temporarily) the problems with:
> > set prefix=(hd0,gpt2)/boot/grub
> > set root=(hd0,gpt2)
> > insmod normal
> > normal
> > and grub menù appears.
> > Login with root, and then update-grub... grub-install... and so on...
> > Restart the system. Grub rescue. Then login with root. New tests.
> > Grub rescue again. [N times?]
> > At the end I downgrade from 2.02+dfsg1-20+deb10u4 to
> > 2.02+dfsg1-20+deb10u3 the upgraded package.
> > update-grub and grub-install. Reboot. Grub works!
> > I am currently reluctant to upgrade again.
> > And now the question. Has anyone reported the error in Devuan? Has
> > anyone haved this problem?
>

> Hi,
> I updated all my boxes and rebooted them without problems (still have
> to reboot the routers, now that you tell I will do it when I'm there
> physically).
>

> Ciao,
> Tito
>

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I bet this is an EFI issue, start by looking there.