package grub-efi-amd64 2.02~beta2-36ubuntu3.22 failed to install/upgrade: subprocess installed post-installation script returned error exit status 10

[Himangshu]

Errors were encountered while processing:
 grub-efi-amd64
 grub-efi
 rsyslog
 ubuntu-minimal
 unattended-upgrades
E: Sub-process /usr/bin/dpkg returned an error code (1)
is shown in thw terminal while upgrading

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: grub-efi-amd64 2.02~beta2-36ubuntu3.22
ProcVersionSignature: Ubuntu 4.15.0-51.55~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-51-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.19
Architecture: amd64
Date: Thu Jul 11 10:12:24 2019
ErrorMessage: subprocess installed post-installation script returned error exit status 10
InstallationDate: Installed on 2018-08-06 (338 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
InvalidGrubScript: /etc/default/grub
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-51-generic root=UUID=16d0682c-ff8f-463a-a8f7-8596e9f2e953 ro
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.5
 apt 1.2.32
SourcePackage: grub2
Title: package grub-efi-amd64 2.02~beta2-36ubuntu3.22 failed to install/upgrade: subprocess installed post-installation script returned error exit status 10
UpgradeStatus: No upgrade log present (probably fresh install)