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Unattended upgrade of grub failed

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I run Bullseye on an UEFI boot machine.  The system originally ran on 
BIOS boot hardware, but this summer I moved it to an UEFI machine by 
installing the EFI version of grub.

This has worked fine since then, with unattended-upgrades succeeding in 
keeping it up-to-date, including kernel upgrades and reboots.

But this morning, unattended-upgrades failed:
> Packages that attempted to upgrade:
>   grub-common grub-efi-amd64-bin grub-efi-amd64-signed grub-pc
>   grub-pc-bin grub2 grub2-common
>
> Packages with upgradable origin but kept back:
>   Debian oldstable-security:
>    grub2-common grub-common grub-pc-bin grub-efi-amd64-signed grub2
>    grub-pc grub-efi-amd64-bin
(The entire mail from unattended-upgrades is quoted below.)

It seems to have a problem with "grub-pc".  But I thought that grub-pc 
was only for BIOS boot, and that by installing the UEFI version grub-pc 
would disappear or at least be disabled.

Do I need to do an uninstall of grub-pc? and will that not be dangerous 
for the EFI version?

I am now somewhat worried - can my system boot at all?  And I expect 
that the point release will be installed tonight - will that mess things 
up further?  Can I simply disable unattended-upgrades with systemctl in 
order to temporarily stop unattended upgrades?

This machine is also my router/firewall/server, so if it fails, 
everything becomes difficult.

Thanks for any help you can offer,
Jesper

The entire mail from unattended-upgrades:

> Unattended upgrade result: All upgrades installed
>
> Packages that attempted to upgrade:
>   grub-common grub-efi-amd64-bin grub-efi-amd64-signed grub-pc
>   grub-pc-bin grub2 grub2-common
>
> Packages with upgradable origin but kept back:
>   Debian oldstable-security:
>    grub2-common grub-common grub-pc-bin grub-efi-amd64-signed grub2
>    grub-pc grub-efi-amd64-bin
>
> Package installation log:
> Log started: 2023-10-08  06:47:58
> apt-listchanges: Reading changelogs...
> Preconfiguring packages ...
> apt-listchanges: Reading changelogs...
> Preconfiguring packages ...
> Preparing to unpack .../0-grub2_2.06-3~deb11u6_amd64.deb ...
> Unpacking grub2 (2.06-3~deb11u6) over (2.06-3~deb11u5) ...
> Preparing to unpack .../1-grub2-common_2.06-3~deb11u6_amd64.deb ...
> Unpacking grub2-common (2.06-3~deb11u6) over (2.06-3~deb11u5) ...
> Preparing to unpack .../2-grub-pc_2.06-3~deb11u6_amd64.deb ...
> Unpacking grub-pc (2.06-3~deb11u6) over (2.06-3~deb11u5) ...
> Preparing to unpack .../3-grub-pc-bin_2.06-3~deb11u6_amd64.deb ...
> Unpacking grub-pc-bin (2.06-3~deb11u6) over (2.06-3~deb11u5) ...
> Preparing to unpack .../4-grub-efi-amd64-bin_2.06-3~deb11u6_amd64.deb ...
> Unpacking grub-efi-amd64-bin (2.06-3~deb11u6) over (2.06-3~deb11u5) ...
> Preparing to unpack .../5-grub-common_2.06-3~deb11u6_amd64.deb ...
> Unpacking grub-common (2.06-3~deb11u6) over (2.06-3~deb11u5) ...
> Setting up grub-common (2.06-3~deb11u6) ...
> Setting up grub-efi-amd64-bin (2.06-3~deb11u6) ...
> Setting up grub2-common (2.06-3~deb11u6) ...
> Setting up grub-pc-bin (2.06-3~deb11u6) ...
> Setting up grub-pc (2.06-3~deb11u6) ...
> /dev/disk/by-id/ata-ST2000DM001-1ER164_W4Z216NL does not exist, so cannot grub-install to it!
> You must correct your GRUB install devices before proceeding:
>
>    DEBIAN_FRONTEND=dialog dpkg --configure grub-pc
>    dpkg --configure -a
> dpkg: error processing package grub-pc (--configure):
>   installed grub-pc package post-installation script subprocess returned error exit status 1
> dpkg: dependency problems prevent configuration of grub2:
>   grub2 depends on grub-pc (= 2.06-3~deb11u6); however:
>    Package grub-pc is not configured yet.
>
> dpkg: error processing package grub2 (--configure):
>   dependency problems - leaving unconfigured
> Processing triggers for man-db (2.9.4-2) ...
> Processing triggers for install-info (6.7.0.dfsg.2-6) ...
> Errors were encountered while processing:
>   grub-pc
>   grub2
> needrestart is being skipped since dpkg has failed
>
> Running kernel seems to be up-to-date.
>
> The processor microcode seems to be up-to-date.
>
> Restarting services...
>   systemctl restart amavisd-milter.service
>
> Service restarts being deferred:
>   /etc/needrestart/restart.d/dbus.service
>   systemctl restartgetty@tty1.service
>   systemctl restart systemd-logind.service
>   systemctl restart unattended-upgrades.service
>
> No containers need to be restarted.
>
> No user sessions are running outdated binaries.
> E:Sub-process /usr/bin/dpkg returned an error code (1)
> Log ended: 2023-10-08  06:48:20
>
>
>
> Unattended-upgrades log:
> Starting unattended upgrades script
> Allowed origins are: origin=Debian,codename=bullseye,label=Debian, origin=Debian,codename=bullseye,label=Debian-Security, origin=Debian,codename=bullseye-security,label=Debian-Security
> Initial blacklist:
> Initial whitelist (not strict):
> Packages that will be upgraded: grub-common grub-efi-amd64-bin grub-efi-amd64-signed grub-pc grub-pc-bin grub2 grub2-common
> Writing dpkg log to /var/log/unattended-upgrades/unattended-upgrades-dpkg.log
> Installing the upgrades failed!
> error message: installArchives() failed
> dpkg returned a error! See /var/log/unattended-upgrades/unattended-upgrades-dpkg.log for details
> Package grub-common is kept back because a related package is kept back or due to local apt_preferences(5).
> Package grub-efi-amd64-bin is kept back because a related package is kept back or due to local apt_preferences(5).
> Package grub-efi-amd64-signed is kept back because a related package is kept back or due to local apt_preferences(5).
> Package grub-pc is kept back because a related package is kept back or due to local apt_preferences(5).
> Package grub-pc-bin is kept back because a related package is kept back or due to local apt_preferences(5).
> Package grub2 is kept back because a related package is kept back or due to local apt_preferences(5).
> Package grub2-common is kept back because a related package is kept back or due to local apt_preferences(5).
>
-- 
Jesper Dybdal
https://www.dybdal.dk

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Unattended upgrade of grub failed Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-10-08 11:20 +0200
  Re: Unattended upgrade of grub failed "Marco M." <mm@dorfdsl.de> - 2023-10-08 11:30 +0200
    Re: Unattended upgrade of grub failed Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-10-08 12:10 +0200
      Re: Unattended upgrade of grub failed Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-10-08 13:40 +0200
        Re: Unattended upgrade of grub failed "Marco M." <mm@dorfdsl.de> - 2023-10-08 14:30 +0200
        Re: Unattended upgrade of grub failed Jeffrey Walton <noloader@gmail.com> - 2023-10-08 19:20 +0200
    Re: Unattended upgrade of grub failed Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-10-08 17:20 +0200
      Re: Unattended upgrade of grub failed Greg Wooledge <greg@wooledge.org> - 2023-10-09 02:40 +0200
  Re: Unattended upgrade of grub failed "Marco M." <mm@dorfdsl.de> - 2023-10-08 11:40 +0200
    Re: Unattended upgrade of grub failed "Marco M." <mm@dorfdsl.de> - 2023-10-08 14:40 +0200

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