[Bug 1897855] 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

** 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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https://bugs.launchpad.net/bugs/1897855

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:
  Error occurred on do-release-upgrade from 18.04 LTS in AWS EC2.

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: grub-pc 2.04-1ubuntu26.4
  ProcVersionSignature: Ubuntu 5.4.0-1025.25~18.04.1-aws 5.4.60
  Uname: Linux 5.4.0-1025-aws x86_64
  ApportVersion: 2.20.11-0ubuntu27.9
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Wed Sep 30 06:12:32 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
  Ec2AMI: ami-03ba3948f6c37a4b0
  Ec2AMIManifest: (unknown)
  Ec2AvailabilityZone: us-west-1a
  Ec2InstanceType: m5.large
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  ErrorMessage: installed grub-pc package post-installation script subprocess returned error exit status 1
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-1025-aws root=UUID=c03b791b-60ef-4ae1-82b5-5c9ab6b4d08f ro console=tty1 console=ttyS0 nvme_core.io_timeout=4294967295
  Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu2
  PythonDetails: /usr/bin/python2.7, Python 2.7.18rc1, 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 2020-09-30 (0 days ago)

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