#1141975 shim-signed preinst fails on UEFI firmware without Secure Boot variables

Package:
shim-signed
Source:
shim-signed
Description:
Secure Boot chain-loading bootloader (Microsoft-signed binary)
Submitter:
Steven Santamorena
Date:
2026-08-03 14:03:02 UTC
Severity:
normal
#1141975#5
Date:
2026-07-13 04:30:19 UTC
From:
To:
Dear Maintainer,

Upgrading shim-signed from 1.47+15.8-1 to 1.51~1+deb13u1+16.1-2~deb13u1 fails in the package pre-installation script on a
system whose firmware supports UEFI booting but apparently does not implement UEFI Secure Boot variables.

The system is a Supermicro X10SLH-F. It is booted in UEFI mode, and efivarfs is mounted normally.
However, the firmware does not expose the SetupMode or SecureBoot variables, and the Aptio firmware setup utility contains
no Secure Boot configuration menus.

The failure occurred during a routine upgrade:

    apt update && apt upgrade -y

The relevant output was:

    Preparing to unpack .../shim-signed_1.51~1+deb13u1+16.1-2~deb13u1_amd64.deb ...
    shim-signed: checking if we can safely install /usr/lib/shim/shimx64.efi.signed
    Unexpected output from mokutil:
    """
    Failed to read "SetupMode" variable: No such file or directory
    """
    Please report this as a bug agsinst shim-signed, including the above information.
    dpkg: error processing archive .../shim-signed_1.51~1+deb13u1+16.1-2~deb13u1_amd64.deb (--unpack):
     new shim-signed:amd64 package pre-installation script subprocess returned error exit status 1

The package upgrade therefore aborts and leaves dpkg in a partially
completed transaction.

   * What led up to the situation?
   * What exactly did you do (or not do) that was effective (or
     ineffective)?
   * What was the outcome of this action?
   * What outcome did you expect instead?

The following checks confirm that the machine is booted using UEFI and that efivarfs is mounted:

   $ test -d /sys/firmware/efi && echo UEFI
   UEFI

   $ findmnt /sys/firmware/efi/efivars
   TARGET                    SOURCE   FSTYPE   OPTIONS
   /sys/firmware/efi/efivars efivarfs efivarfs rw,nosuid,nodev,noexec,relatime

mokutil produces:

   $ mokutil --sb-state
   Failed to read "SetupMode" variable: No such file or directory

The motherboard firmware supports normal UEFI booting, EFI boot entries, and EFI runtime variables, but appears not to
implement Secure Boot.
There are no Secure Boot, Key Management, PK, KEK, db, or dbx settings in the motherboard's firmware setup utility.

Expected result:

The package should recognize firmware without Secure Boot support, or allow installation to continue with a warning or
explicit administrator override.

Actual result:

The pre-installation script treats mokutil's failure to read SetupMode as fatal and blocks the complete apt/dpkg transaction.

This system was originally installed by the Debian installer in UEFI mode.
shim-signed was installed automatically as part of that installation; Secure Boot was not enabled.

Motherboard:
    Manufacturer: Supermicro
    Model: X10SLH-F
    BIOS version: 3.4
    BIOS release date: 01/21/2021

Please let me know if additional EFI variable or firmware information would be useful.

#1141975#10
Date:
2026-07-13 12:55:33 UTC
From:
To:
Hi Steven,

Thanks for your bug report!

Argh. That's annoying behaviour that I've not seen before despite a
lot of testing on a range of different systems. :-(

I'll get working on a fix for this ASAP.

Again, thanks for the bug report and thanks even more for the
diagnostics you've included here - it's just what I need.
-- 
Steve McIntyre, Cambridge, UK.                                steve@einval.com
"Every time you use Tcl, God kills a kitten." -- Malcolm Ray

#1141975#15
Date:
2026-07-13 13:47:45 UTC
From:
To:
Also, while I think...

Have you checked to see if there are any firmware updates for this
machine? This may well be fixed there, if so.
-- 
Steve McIntyre, Cambridge, UK.                                steve@einval.com
  Mature Sporty Personal
  More Innovation More Adult
  A Man in Dandism
  Powered Midship Specialty

#1141975#20
Date:
2026-07-13 14:31:07 UTC
From:
To:
As far as I can tell, the firmware version I'm using (3.4) is the latest.
It it the most recent version available from the SuperMicro Support page
for this motherboard:
https://www.supermicro.com/en/support/resources/downloadcenter/MBD-X10SLH-F

I also had a recent email conversation with their support for an unrelated
issue where they confirmed 3.4 is the current release. I believe this
motherboard is also EOL for SuperMicro, so further updates to support
secure boot are unlikely.

#1141975#25
Date:
2026-07-13 15:36:32 UTC
From:
To:
ACK, fair enough. Thanks for checking!
#1141975#30
Date:
2026-08-03 14:01:34 UTC
From:
To:
Hi, here ist the inforamtion you requested:

Base Board Information
        Manufacturer: Supermicro
        Product Name: X9DR3-F
        Version: 0123456789
        Serial Number: VM14BS021097
        Asset Tag: To be filled by O.E.M.
        Features:
                Board is a hosting board
                Board is replaceable
        Location In Chassis: To be filled by O.E.M.
        Chassis Handle: 0x0003
        Type: Motherboard
        Contained Object Handles: 0
---------------- BIOS Information Vendor: American Megatrends Inc. Version: 3.0b Release Date: 06/30/2014 Address: 0xF0000 Runtime Size: 64 kB ROM Size: 8 MB Characteristics: PCI is supported BIOS is upgradeable BIOS shadowing is allowed Boot from CD is supported Selectable boot is supported BIOS ROM is socketed EDD is supported 5.25"/1.2 MB floppy services are supported (int 13h) 3.5"/720 kB floppy services are supported (int 13h) 3.5"/2.88 MB floppy services are supported (int 13h) Print screen service is supported (int 5h) 8042 keyboard services are supported (int 9h) Serial services are supported (int 14h) Printer services are supported (int 17h) ACPI is supported USB legacy is supported BIOS boot specification is supported Function key-initiated network boot is supported Targeted content distribution is supported UEFI is supported BIOS Revision: 1.0 Viele Grüße Adrian Handt Systems Integrator / Systemintegrator DaPhi GmbH Bornitzstraße 51, D-10365 Berlin, Germany fon: +49 (30) 33 85 36 700 mail: serviceteam-saturn@daphi.de www.daphi.de DaPhi GmbH CEO: Daniel Strobl, Philipp Krey Commercial Register Berlin, No. HRB 117997 B VAT-ID: DE 263760318 Ticket History =================== Microsoft Outlook (Recipient (CC)) Posted On: 01 August 2026 03:40 PM =============================================================== Thank you for contacting us. This is an automated response confirming the receipt of your ticket. One of our agents will get back to you in next 24h. For your records, the details of the ticket are listed below. When replying, please make sure that the ticket ID is kept in the subject line to ensure that your replies are tracked appropriately. In urgent cases you can also call us: +49 30 33 85 36 - 500 Ticket ID: KKP-904-96118 Subject: [Bug 7865] shim-signed package update failed Department: Serviceteam Pluto Type: Support Status: Open Priority: B You can check the status of or update this ticket online at: https://support.daphi.de/index.php/Tickets/Ticket/View/KKP-904-96118 Kind regards, DaPhi GmbH
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Do not click on any links or open attachments unless you recognise the sender and know the content is safe Fabian Grünbichler changed bug 7865 What Removed Added Resolution --- MOVED Status NEW RESOLVED Product pve common Component Kernel Backend/API CC f.gruenbichler@proxmox.com Version 9 trixie-based Comment # 1 on bug 7865 from Fabian Grünbichler this is https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1141975 could you add your system details (mainboard model, firmware version) there?