Bug#988059: shim-signed fails to install on non-EFI system

[Jörgen Hägg <jh@axis.com>]

Package: shim-signed
Version: 1.34+15.4-2
Severity: important


Setting up shim-signed:amd64 (1.34+15.4-2) ...
cat: /sys/firmware/efi/fw_platform_size: No such file or directory
dpkg: error processing package shim-signed:amd64 (--configure):
 installed shim-signed:amd64 package post-installation script subprocess returne
d error exit status 1
Errors were encountered while processing:
 shim-signed:amd64

Maybe this is the reason?

# mokutil --sb-state          
EFI variables are not supported on this system

Is there a workaround?
Can I remove shim-signed?

(This is sid)

-- System Information:
Debian Release: 11.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'oldstable'), (101, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.10.0-3-amd64 (SMP w/8 CPU threads)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_SE:en_US:en_GB:en
Shell: /bin/sh linked to /bin/bash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages shim-signed depends on:
ii  grub-efi-amd64-bin         2.04-18
ii  grub2-common               2.04-18
ii  shim-helpers-amd64-signed  1+15.4+2

Versions of packages shim-signed recommends:
pn  secureboot-db  <none>

shim-signed suggests no packages.

-- no debconf information