package grub-efi-amd64-signed 1.142.9+2.04-1ubuntu26.7 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1

[Michael Whitehouse]

Error message and crash every time I boot.

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: grub-efi-amd64-signed 1.142.9+2.04-1ubuntu26.7
ProcVersionSignature: Ubuntu 5.4.0-60.67-generic 5.4.78
Uname: Linux 5.4.0-60-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
CasperMD5CheckResult: skip
Date: Mon Jan 4 01:43:55 2021
Df:
 Filesystem 1K-blocks Used Available Use% Mounted on
 /dev/sdc1 31617700 6709048 23279476 23% /
 /dev/sdb1 3909144 3900956 8188 100% /cdrom
 udev 1715396 0 1715396 0% /dev
 tmpfs 347572 1680 345892 1% /run
ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
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-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.2ubuntu0.2
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.142.9+2.04-1ubuntu26.7 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)