package grub-efi-amd64-signed 1.93.15+2.02-2ubuntu8.14 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 255

[Sam Hamed]

I have no more Infos because I am new to ubuntu!

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: grub-efi-amd64-signed 1.93.15+2.02-2ubuntu8.14
ProcVersionSignature: Ubuntu 4.15.0-1021.24-oem 4.15.18
Uname: Linux 4.15.0-1021-oem x86_64
ApportVersion: 2.20.9-0ubuntu7.2
AptOrdering:
 amd64-microcode:amd64: Install
 NULL: ConfigurePending
Architecture: amd64
Date: Mon Apr 13 11:00:48 2020
DistributionChannelDescriptor:
 # This is the distribution channel descriptor for the OEM CDs
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-bionic-amd64-20180608-47+loki-n3-v3-kbl+X28
DpkgHistoryLog:
 Start-Date: 2020-04-13 11:00:47
 Commandline: /usr/bin/unattended-upgrade
 Upgrade: amd64-microcode:amd64 (3.20180524.1~ubuntu0.18.04.2, 3.20191021.1+really3.20181128.1~ubuntu0.18.04.1)
DpkgTerminalLog:
 Vorbereitung zum Entpacken von .../amd64-microcode_3.20191021.1+really3.20181128.1~ubuntu0.18.04.1_amd64.deb ...
 Entpacken von amd64-microcode (3.20191021.1+really3.20181128.1~ubuntu0.18.04.1) über (3.20180524.1~ubuntu0.18.04.2) ...
 grub-efi-amd64-signed (1.93.15+2.02-2ubuntu8.14) wird eingerichtet ...
 dpkg: Fehler beim Bearbeiten des Paketes grub-efi-amd64-signed (--configure):
  installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 255
ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 255
InstallationDate: Installed on 2019-11-10 (155 days ago)
InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 20180608-09:38
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 1.6.1
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.93.15+2.02-2ubuntu8.14 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 255
UpgradeStatus: No upgrade log present (probably fresh install)