[Bug 1849631] Re: package grub-pc 2.04-1ubuntu12 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1

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** Tags removed: need-duplicate-check

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Title:
  package grub-pc 2.04-1ubuntu12 failed to install/upgrade: installed
  grub-pc package post-installation script subprocess returned error
  exit status 1

Status in grub2 package in Ubuntu:
  New

Bug description:
  This happened immediately after restart following upgrade from 19.04
  to 19.10 without any intervention.

  ProblemType: Package
  DistroRelease: Ubuntu 19.10
  Package: grub-pc 2.04-1ubuntu12
  Uname: Linux 4.20.0-042000-generic x86_64
  ApportVersion: 2.20.11-0ubuntu8
  Architecture: amd64
  Date: Thu Oct 24 09:54:32 2019
  ErrorMessage: installed grub-pc package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2018-09-03 (415 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  InvalidGrubScript: /etc/grub.d/25_custom
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.20.0-042000-generic root=UUID=222d2c83-ad55-472d-a766-e2e14bacc688 ro quiet splash noresume vt.handoff=1
  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 2.04-1ubuntu12 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to eoan on 2019-10-24 (0 days ago)

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