[Bug 1788368] Re: package grub-efi-amd64 2.02-2ubuntu8.3 failed to install/upgrade: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 1

[Julian Andres Klode]

*** This bug is a duplicate of bug 1788727 ***
    https://bugs.launchpad.net/bugs/1788727

That's precisely why the upgrade crashed: to prevent you from having an
unbootable system.

E: Your kernels are unsigned. This system will fail to boot in a secure
boot environment.

It even shows a big scary dialog on the desktop explaining all that.

** This bug has been marked a duplicate of bug 1788727
   upgrade crashing due to unsigned kernels

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https://bugs.launchpad.net/bugs/1788368

Title:
  package grub-efi-amd64 2.02-2ubuntu8.3 failed to install/upgrade:
  installed grub-efi-amd64 package post-installation script subprocess
  returned error exit status 1

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  A problem occurred during upgrade to 18.

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: grub-efi-amd64 2.02-2ubuntu8.3
  ProcVersionSignature: Ubuntu 4.4.0-134.160-generic 4.4.140
  Uname: Linux 4.4.0-134-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.3
  Architecture: amd64
  Date: Wed Aug 22 12:17:34 2018
  ErrorMessage: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2014-08-02 (1480 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  InvalidGrubScript: /etc/grub.d/25_custom
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-134-generic root=UUID=9ab5fc27-2343-4525-bb45-775a6db7e1c3 ro quiet splash vt.handoff=7
  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  1.6.3ubuntu0.1
  SourcePackage: grub2
  Title: package grub-efi-amd64 2.02-2ubuntu8.3 failed to install/upgrade: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to bionic on 2018-08-22 (0 days ago)

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