package "grub-efi-amd64-signed" installation failed. Can only be stopped by killing process

[Ralph]

Really a pain.
I have to kill do CTRL-Z and kill the processes.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: grub-efi-amd64-signed 1.93.3+2.02-2ubuntu8.2
ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
Uname: Linux 4.15.0-29-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
Date: Fri Jul 27 15:28:18 2018
ErrorMessage: Unterprozess installed grub-efi-amd64-signed package post-installation script wurde durch das Signal (Beendet) getötet
Python3Details: /usr/bin/python3.6, Python 3.6.5, 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 1.6.3
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.93.3+2.02-2ubuntu8.2 failed to install/upgrade: Unterprozess installed grub-efi-amd64-signed package post-installation script wurde durch das Signal (Beendet) getötet
UpgradeStatus: No upgrade log present (probably fresh install)