package grub-pc 2.02~beta2-36ubuntu3.18 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Marmot]

Upgrading from 16.04 LTS to 18.04 LTS

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: grub-pc 2.02~beta2-36ubuntu3.18
ProcVersionSignature: Ubuntu 4.13.0-41.46~16.04.1-generic 4.13.16
Uname: Linux 4.13.0-41-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
Date: Sat Sep 22 10:46:36 2018
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2017-08-26 (392 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-41-generic root=UUID=165cd5e7-dc46-417d-b8dc-2b941b5ff441 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.4
 apt 1.2.27
SourcePackage: grub2
Title: package grub-pc 2.02~beta2-36ubuntu3.18 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to xenial on 2018-09-22 (0 days ago)