package shim-signed 1.40.9+15.7-0ubuntu1 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 32

[Matthew Milner]

not sure

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: shim-signed 1.40.9+15.7-0ubuntu1
ProcVersionSignature: Ubuntu 5.15.0-92.102~20.04.1-generic 5.15.131
Uname: Linux 5.15.0-92-generic x86_64
.proc.sys.kernel.moksbstate_disabled: Error: [Errno 2] No such file or directory: '/proc/sys/kernel/moksbstate_disabled'
ApportVersion: 2.20.11-0ubuntu27.27
Architecture: amd64
BootEFIContents:
 BOOTX64.CSV
 grub.cfg
 grubx64.efi
 mmx64.efi
 shimx64.efi
CasperMD5CheckResult: skip
Date: Tue Feb 20 22:59:48 2024
ErrorMessage: installed shim-signed package post-installation script subprocess returned error exit status 32
InstallationDate: Installed on 2024-01-29 (22 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
Python3Details: /usr/bin/python3.8, Python 3.8.10, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3.2
 apt 2.0.10
SecureBoot: 6 0 0 0 0
ShimDiff: Binary files /boot/efi/EFI/ubuntu/shimx64.efi and /usr/lib/shim/shimx64.efi.signed differ
SourcePackage: shim-signed
Title: package shim-signed 1.40.9+15.7-0ubuntu1 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 32
UpgradeStatus: No upgrade log present (probably fresh install)

[Steve Langasek (vorlon)]

The error in your log is:

update-alternatives: using /usr/lib/shim/shimx64.efi.signed.latest to provide /usr/lib/shim/shimx64.efi.signed (shimx64.efi.signed) in auto mode
mount: /var/lib/grub/esp: special device /, does not exist.
dpkg: error processing package shim-signed (--configure):
 installed shim-signed package post-installation script subprocess returned error exit status 32

This appears to be a corrupted grub debconf setting on your system. Please run 'sudo dpkg-reconfigure grub-efi-amd64-signed' to correct it.