package grub-efi-amd64-signed 1.93.1+2.02-2ubuntu8.1 failed to install/upgrade: Unterprozess installed grub-efi-amd64-signed package post-installation script gab den Fehler-Ausgangsstatus 1 zurück

[Ralph]

Doing a regular "sudo apt upgrade" on a lubuntu system (single operating system)

cat /proc/version
Linux version 4.15.0-23-generic (buildd@lgw01-amd64-055) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #25-Ubuntu SMP Wed May 23 18:02:16 UTC 2018

Hardware is an acer laptop. Version: TravelMate Spin B118

ralph@B118:~$ cat /proc/cpuinfo
..
model name : Intel(R) Celeron(R) CPU N3450 @ 1.10GHz
...

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: grub-efi-amd64-signed 1.93.1+2.02-2ubuntu8.1
ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
Uname: Linux 4.15.0-23-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
Date: Tue Jul 10 17:24:37 2018
ErrorMessage: Unterprozess installed grub-efi-amd64-signed package post-installation script gab den Fehler-Ausgangsstatus 1 zurück
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.2
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.93.1+2.02-2ubuntu8.1 failed to install/upgrade: Unterprozess installed grub-efi-amd64-signed package post-installation script gab den Fehler-Ausgangsstatus 1 zurück
UpgradeStatus: No upgrade log present (probably fresh install)