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From: Michael Biebl <biebl@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: booting Windows via grub is broken
Message-ID: <177938313421.7268.17706988545240050118.reportbug@mars>
X-Mailer: reportbug 13.2.0
Date: Thu, 21 May 2026 19:05:34 +0200
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Package: shim-signed
Version: 1.50+16.1-2
Severity: important

Hi,

I have a dual boot system with Windows 11 and Debian Sid.

Grub is setup to generate a boot entry for Windows (via 30_os-prober).

This has worked fine so far.

Since the upgrade of shim-signed from 1.47 to 1.50, I can no longer boot
Windows. After selecting the boot entry, grub just "hangs" and does
nothing.


Downgrading to 1.47 fixes the problem.

Regards
Michael


-- System Information:
Debian Release: forky/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 7.0.7+deb14-amd64 (SMP w/16 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages shim-signed depends on:
ii  debconf [debconf-2.0]      1.5.92
ii  grub-efi-amd64-bin         2.14-2
ii  grub2-common               2.14-2
ii  mokutil                    0.7.2-2
ii  shim-helpers-amd64-signed  1+16.1+2
ii  shim-signed-common         1.50+16.1-2

shim-signed recommends no packages.

shim-signed suggests no packages.

-- debconf information:
  shim-signed/revoked-sig:
  shim-signed/no-valid-sigs:
]