package grub-pc 2.02-2ubuntu8.12 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1

[Tim Kennell Jr.]

upgrade from ubuntu 16.04 to 18.04, automated bug report

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: grub-pc 2.02-2ubuntu8.12
ProcVersionSignature: Ubuntu 4.4.0-97.120-generic 4.4.87
Uname: Linux 4.4.0-97-generic i686
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: i386
Date: Sat Mar 9 20:32:07 2019
ErrorMessage: installed grub-pc package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2016-02-09 (1125 days ago)
InstallationMedia: Ubuntu-Server 14.04.3 LTS "Trusty Tahr" - Beta i386 (20150805)
ProcCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-97-generic root=/dev/mapper/hostname--vg-root ro
Python3Details: /usr/bin/python3.6, Python 3.6.7, python3-minimal, 3.6.7-1~18.04
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
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 1
UpgradeStatus: Upgraded to bionic on 2019-03-10 (0 days ago)