package grub-efi-amd64-signed 1.93.16+2.02-2ubuntu8.15 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1

[Jonathan W. Trent]

Did an update and received error.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: grub-efi-amd64-signed 1.93.16+2.02-2ubuntu8.15
ProcVersionSignature: Ubuntu 4.15.0-91.92-generic 4.15.18
Uname: Linux 4.15.0-91-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.13
Architecture: amd64
Date: Wed Apr 1 18:16:43 2020
ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2016-09-16 (1293 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
Python3Details: /usr/bin/python3.6, Python 3.6.9, python3-minimal, 3.6.7-1~18.04
PythonDetails: /usr/bin/python2.7, Python 2.7.17, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2.3
 apt 1.6.12
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.93.16+2.02-2ubuntu8.15 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to bionic on 2018-08-15 (595 days ago)

[Launchpad Janitor (janitor)]

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