[Bug 1923336] Re: package grub-efi-amd64-signed 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 1928352 ***
    https://bugs.launchpad.net/bugs/1928352

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 1928352, 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 1928352
   package shim-signed 1.47+15.4-0ubuntu2 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 1

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https://bugs.launchpad.net/bugs/1923336

Title:
  package grub-efi-amd64-signed 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:
  Trying to install Ubuntu Unity 21.04 to grub-install shows error.
  Unable to confirm if system is not bootable as the PC is a multiboot
  system and booted from UM grub.

  ProblemType: Package
  DistroRelease: Ubuntu 21.04
  Package: grub-efi-amd64-signed 1.169+2.04-1ubuntu45
  ProcVersionSignature: Ubuntu 5.11.0-13.14-generic 5.11.7
  Uname: Linux 5.11.0-13-generic x86_64
  ApportVersion: 2.20.11-0ubuntu61
  Architecture: amd64
  CasperMD5CheckResult: pass
  Date: Sun Apr 11 13:07:18 2021
  ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2021-04-11 (0 days ago)
  InstallationMedia: Ubuntu Unity 21.04
  Python3Details: /usr/bin/python3.9, Python 3.9.2, python3-minimal, 3.9.2-2
  PythonDetails: N/A
  RelatedPackageVersions:
   dpkg 1.20.7.1ubuntu4
   apt  2.2.2
  SourcePackage: grub2-signed
  Title: package grub-efi-amd64-signed 1.169+2.04-1ubuntu45 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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