[Bug 1901087] 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

[Julian Andres Klode]

*** This bug is a duplicate of bug 1896608 ***
    https://bugs.launchpad.net/bugs/1896608

Well, you did upgrade from 18.04 to 20.04, but that's irrelevant to this
bug report, which is a duplicate of bug 1896608. But how can you be
surprised about having upgraded after an upgrade?

** This bug has been marked a duplicate of bug 1896608
   [regression-in-stable] grub-multi-install fails with exit 1 when question grub-efi/install_devices_empty is skipped

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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:
  Confirmed

Bug description:
  I had to power cycle my server and it shows that I am running Ubuntu
  20.04.1 LTS now

  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: Thu Oct 22 20:36:30 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
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-122-generic root=UUID=4f8b85db-8c11-422b-83c4-c74195f67b91 ro console=tty1 root=LABEL=DOROOT notsc clocksource=kvm-clock net.ifnames=0
  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 2020-10-22 (0 days ago)

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