package grub-pc 2.02-2ubuntu8.4 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1

[[e-mail]]

Don't know.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: grub-pc 2.02-2ubuntu8.4
ProcVersionSignature: Ubuntu 4.15.0-34.37~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-34-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.3
Architecture: amd64
Date: Wed Sep 26 15:09:06 2018
DeviceMap:
 (hd0) /dev/sda
 (hd1) /dev/sdb
 (hd2) /dev/sdc
ErrorMessage: installed grub-pc package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2017-03-13 (561 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-34-generic root=UUID=e1ff9825-a556-4d14-8470-22fb7532c8d6 ro quiet splash vt.handoff=7
Python3Details: /usr/bin/python3.6, Python 3.6.6, python3-minimal, 3.6.5-3ubuntu1
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.3ubuntu0.1
SourcePackage: grub2
Title: package grub-pc 2.02-2ubuntu8.4 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to bionic on 2018-09-26 (0 days ago)