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?

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< Viverna >
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          \  /0  0  \__  /    //  | \ \           *----*
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            @_^_@`/   \/_   //    |   \   \         \/\ \
            //_^_/     \/_ //     |    \    \         \  \
         ( //) |        \///      |     \     \       |  |
       ( / /)  |         //       |      \     _\     |  /
     ( // /)   |          ; -.    |    _ _\.-~       /   /
   (( / / ))   |        _      *-.|.-~-.           .~    ~
  (( // / ))    \      /                 ~-. _ .-~      /
  (( /// ))      `.   }            {                   /
   (( / ))      .----~-.\        \-`                 .~
                ///.----..<        \             _ -~
                   ///-._ _ _ _ _ _ _{^ - - - - ~