package grub-efi-amd64-signed 1.93.24+2.02-2ubuntu8.21 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 1.93.24+2.02-2ubuntu8.21
ProcVersionSignature: Ubuntu 4.4.0-209.241-generic 4.4.262
Uname: Linux 4.4.0-209-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.23
Architecture: amd64
Date: Fri Apr 16 07:44:30 2021
ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2021-04-15 (0 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 1.6.13
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.93.24+2.02-2ubuntu8.21 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to bionic on 2021-04-16 (0 days ago)