package grub-efi-amd64-signed (not installed) failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1

[Babak Hamidpour]

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ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: grub-efi-amd64-signed (not installed)
ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
Uname: Linux 4.15.0-43-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
Date: Mon Jan 7 21:08:10 2019
Df:
 Filesystem 1K-blocks Used Available Use% Mounted on
 /dev/sda7 100479040 4959076 90372880 6% /
 /dev/sdb1 7846912 2630608 5216304 34% /cdrom
 udev 3992148 0 3992148 0% /dev
 tmpfs 802664 1744 800920 1% /run
ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3ubuntu1
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.3
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed (not installed) 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)