Bug#1137247: booting Windows via grub is broken

[Michael Biebl]

Am 21.05.26 um 22:52 schrieb Michael Biebl:

Hi Steve

Am 21.05.26 um 19:53 schrieb Steve McIntyre:

On Thu, May 21, 2026 at 07:05:34PM +0200, Michael Biebl wrote:

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.

Argh. What hardware is this on, please?

It's a framework 13, AMD 7040

Shim does have built-in debug here, which might help. From userland
could you please try

$ mokutil --set-verbosity true

and see if anything obvious shows up? Warning: it is *very* verbose
here.

After grub had finally loaded, I selected the Windows boot entry.

What you see in the attached screen shot is what happened next.

You did not exaggerate. I got walls of text for about a minute or so (Can I capture this output somehow)? At this point, the boot process stops. I can reset the machine via CTRL+ALT+DELETE.

Not sure if it's relevant:



# find /var/lib/dkms/
/var/lib/dkms/
/var/lib/dkms/virtualbox
/var/lib/dkms/virtualbox/kernel-7.0.7+deb14-amd64-x86_64
/var/lib/dkms/virtualbox/7.2.8
/var/lib/dkms/virtualbox/7.2.8/source
/var/lib/dkms/virtualbox/7.2.8/7.0.7+deb14-amd64
/var/lib/dkms/virtualbox/7.2.8/7.0.7+deb14-amd64/x86_64
/var/lib/dkms/virtualbox/7.2.8/7.0.7+deb14-amd64/x86_64/module
/var/lib/dkms/virtualbox/7.2.8/7.0.7+deb14-amd64/x86_64/module/Module.symvers
/var/lib/dkms/virtualbox/7.2.8/7.0.7+deb14-amd64/x86_64/module/vboxnetflt.ko.xz
/var/lib/dkms/virtualbox/7.2.8/7.0.7+deb14-amd64/x86_64/module/vboxnetadp.ko.xz
/var/lib/dkms/virtualbox/7.2.8/7.0.7+deb14-amd64/x86_64/module/vboxdrv.ko.xz
/var/lib/dkms/virtualbox/7.2.8/7.0.7+deb14-amd64/x86_64/log
/var/lib/dkms/virtualbox/7.2.8/7.0.7+deb14-amd64/x86_64/log/make.log
/var/lib/dkms/mok.pub

I do have virtualbox(-dkms) installed and have enrolled a custom signing key via /var/lib/dkms/mok.pub

OpenPGP_signature.asc
Description: OpenPGP digital signature