[Bug 1848826] Re: package grub-pc (not installed) failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 20

[Apport retracing service]

** Tags removed: need-duplicate-check

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https://bugs.launchpad.net/bugs/1848826

Title:
  package grub-pc (not installed) failed to install/upgrade: installed
  grub-pc package post-installation script subprocess returned error
  exit status 20

Status in grub2 package in Ubuntu:
  New

Bug description:
  I got around the issue by uninstalling grub
  https://stackoverflow.com/questions/53203528/errors-grub-efi-amd64-signed-shim-signed
  ```
  # sudo apt-get purge grub\*
  # sudo apt-get install grub-efi
  # sudo apt-get autoremove
  # sudo update-grub
  ```

  ProblemType: Package
  DistroRelease: Ubuntu 19.10
  Package: grub-pc (not installed)
  ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
  Uname: Linux 5.3.0-18-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu8
  Architecture: amd64
  Date: Fri Oct 18 20:38:46 2019
  DuplicateSignature:
   package:grub-pc:(not installed)
   Setting up grub-pc (2.04-1ubuntu12) ...
   dpkg: error processing package grub-pc (--configure):
    installed grub-pc package post-installation script subprocess returned error exit status 20
  ErrorMessage: installed grub-pc package post-installation script subprocess returned error exit status 20
  InstallationDate: Installed on 2019-06-12 (128 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  ProcCmdLine: BOOT_IMAGE=/vmlinuz-5.3.0-18-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  Python3Details: /usr/bin/python3.7, Python 3.7.5rc1, python3-minimal, 3.7.5-1
  PythonDetails: /usr/bin/python2.7, Python 2.7.17rc1, python-minimal, 2.7.17-1
  RelatedPackageVersions:
   dpkg 1.19.7ubuntu2
   apt  1.9.4
  SourcePackage: grub2
  Title: package grub-pc (not installed) failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 20
  UpgradeStatus: Upgraded to eoan on 2019-10-19 (0 days ago)

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