[Bug 1901329] Re: package grub-pc 2.04-1ubuntu26.4 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1

[Apport retracing service]

*** This bug is a duplicate of bug 1901087 ***
    https://bugs.launchpad.net/bugs/1901087

Thank you for taking the time to report this crash and helping to make
this software better.  This particular crash has already been reported
and is a duplicate of bug #1901087, so 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.

** Tags removed: need-duplicate-check

** This bug has been marked a duplicate of bug 1901087
   package grub-pc 2.04-1ubuntu26.4 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1

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https://bugs.launchpad.net/bugs/1901329

Title:
  package grub-pc 2.04-1ubuntu26.4 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:
  upgrading from 18.04 to 20.04

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: grub-pc 2.04-1ubuntu26.4
  ProcVersionSignature: Ubuntu 4.15.0-122.124-generic 4.15.18
  Uname: Linux 4.15.0-122-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.10
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Sat Oct 24 12:12:22 2020
  DuplicateSignature:
   package:grub-pc:2.04-1ubuntu26.4
   Setting up grub-pc (2.04-1ubuntu26.4) ...
   dpkg: error processing package grub-pc (--configure):
    installed grub-pc package post-installation script subprocess returned error exit status 1
  ErrorMessage: installed grub-pc package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2017-06-02 (1239 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-122-generic root=UUID=1f2ec906-6f75-74e2-a666-4f8719044c91 ro quiet splash vt.handoff=1
  Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 3.8.2-0ubuntu2
  PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
  RelatedPackageVersions:
   dpkg 1.19.7ubuntu3
   apt  2.0.2ubuntu0.1
  SourcePackage: grub2
  Title: package grub-pc 2.04-1ubuntu26.4 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to focal on 2020-10-24 (0 days ago)

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