package grub-efi-amd64-signed 1.93+2.02-2ubuntu8 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1

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ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: grub-efi-amd64-signed 1.93+2.02-2ubuntu8
ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
Uname: Linux 4.15.0-23-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
AptOrdering:
 apache2:amd64: Install
 apache2-bin:amd64: Install
 apache2-utils:amd64: Install
 apache2-data:amd64: Install
 NULL: ConfigurePending
Architecture: amd64
Date: Mon Jul 2 08:16:07 2018
DpkgHistoryLog:
 Start-Date: 2018-07-02 08:14:35
 Commandline: aptdaemon role='role-commit-packages' sender=':1.9798'
 Upgrade: apache2-data:amd64 (2.4.29-1ubuntu4.1, 2.4.29-1ubuntu4.2), apache2-bin:amd64 (2.4.29-1ubuntu4.1, 2.4.29-1ubuntu4.2), apache2:amd64 (2.4.29-1ubuntu4.1, 2.4.29-1ubuntu4.2), apache2-utils:amd64 (2.4.29-1ubuntu4.1, 2.4.29-1ubuntu4.2)
ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2017-09-21 (283 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.1
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.93+2.02-2ubuntu8 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to bionic on 2018-05-14 (49 days ago)