package grub-efi-amd64-signed 1.142.11+2.04-1ubuntu26.9 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 255

[Jon]

crashed on upgrade

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: grub-efi-amd64-signed 1.142.11+2.04-1ubuntu26.9
ProcVersionSignature: Ubuntu 5.4.0-70.78-generic 5.4.94
Uname: Linux 5.4.0-70-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
Date: Wed Mar 31 10:43:01 2021
ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 255
InstallationDate: Installed on 2019-12-09 (477 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
Python3Details: /usr/bin/python3.8, Python 3.8.5, 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
 apt 2.0.4
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.142.11+2.04-1ubuntu26.9 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 255
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.