package grub-efi-amd64-signed 1.167~16.04.4+2.04-1ubuntu44.1 failed to install/upgrade: Unterprozess installiertes post-installation-Skript gab den Fehlerwert 1 zurück

[Volker]

The error prevents me from updating my system.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: grub-efi-amd64-signed 1.167~16.04.4+2.04-1ubuntu44.1
ProcVersionSignature: Ubuntu 4.4.0-210.242-generic 4.4.262
Uname: Linux 4.4.0-210-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.30
Architecture: amd64
Date: Tue Jun 8 08:34:20 2021
ErrorMessage: Unterprozess installiertes post-installation-Skript gab den Fehlerwert 1 zurück
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.7
 apt 1.2.35
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.167~16.04.4+2.04-1ubuntu44.1 failed to install/upgrade: Unterprozess installiertes post-installation-Skript gab den Fehlerwert 1 zurück
UpgradeStatus: Upgraded to xenial on 2016-09-17 (1724 days ago)