[Bug 1790994] Re: package grub-efi-amd64-signed 1.93.5+2.02-2ubuntu8.4 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1

[Steve Langasek]

*** This bug is a duplicate of bug 1805490 ***
    https://bugs.launchpad.net/bugs/1805490

Thank you for taking the time to report this bug and helping to make
Ubuntu better. This particular bug has already been reported and is a
duplicate of bug 1805490, so it is being marked as such. Please look at
the other bug report to see if there is any missing information that you
can provide, or to see if there is a workaround for the bug.
Additionally, any further discussion regarding the bug should occur in
the other report.  Please continue to report any other bugs you may
find.

** This bug has been marked a duplicate of bug 1805490
   [master] Grub2 Failed to install "efibootmgr failed to register the boot entry: Block device required. / Could not delete variable: Invalid argument"

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Title:
  package grub-efi-amd64-signed 1.93.5+2.02-2ubuntu8.4 failed to
  install/upgrade: installed grub-efi-amd64-signed package post-
  installation script subprocess returned error exit status 1

Status in grub2-signed package in Ubuntu:
  Confirmed

Bug description:
  I just tried to update

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: grub-efi-amd64-signed 1.93.5+2.02-2ubuntu8.4
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: kpatch_livepatch_Ubuntu_4_15_0_23_25_generic_42
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  Date: Wed Sep  5 21:01:50 2018
  ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2016-05-05 (853 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  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-signed
  Title: package grub-efi-amd64-signed 1.93.5+2.02-2ubuntu8.4 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to bionic on 2018-05-03 (125 days ago)

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