package grub-pc 2.02-2ubuntu8.12 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 10

[Asmita Neupane]

It creates error in even updating files.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: grub-pc 2.02-2ubuntu8.12
ProcVersionSignature: Ubuntu 4.15.0-44.47-generic 4.15.18
Uname: Linux 4.15.0-44-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
Date: Wed Feb 13 12:07:26 2019
DuplicateSignature:
 package:grub-pc:2.02-2ubuntu8.12
 Setting up gns3 (0.8.7-2) ...
 dpkg: error processing package gns3 (--configure):
  installed gns3 package post-installation script subprocess returned error exit status 10
ErrorMessage: installed grub-pc package post-installation script subprocess returned error exit status 10
InstallationDate: Installed on 2018-09-29 (136 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-44-generic root=UUID=b7e2c8e7-e74e-42dc-8c48-c0552dc186fc ro quiet splash vt.handoff=1
Python3Details: /usr/bin/python3.6, Python 3.6.7, unpackaged
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, unpackaged
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2.1
 apt 1.6.8
SourcePackage: grub2
Title: package grub-pc 2.02-2ubuntu8.12 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 10
UpgradeStatus: No upgrade log present (probably fresh install)