[Bug 1944443] Re: package grub-common 2.04-1ubuntu26.13 failed to install/upgrade: installed grub-common 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-common 2.04-1ubuntu26.13 failed to install/upgrade:
  installed grub-common package post-installation script subprocess
  returned error exit status 1

Status in grub2 package in Ubuntu:
  New

Bug description:
  This system as a ZFS filesystem for both user data and boot/program files.
  It originally occurred some weeks ago and has now appeared on another machine using the same configuration but completely different hardware.

  The problem ultimately lists various grub related packages and states
  that grub-pc is "not configured".  However I've been unable to
  discover what it means, nor what it expects.

  The problem reoccurs every time I update or add new applications to
  the systems.

  The systems themselves still boot, with no apparently problem.  They
  also appear to operate properly after boot.

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: grub-common 2.04-1ubuntu26.13
  ProcVersionSignature: Ubuntu 5.11.0-34.36~20.04.1-generic 5.11.22
  Uname: Linux 5.11.0-34-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.20
  AptOrdering:
   vivaldi-stable:amd64: Install
   libprocps8:amd64: Install
   procps:amd64: Install
   libtiff5:amd64: Install
   NULL: ConfigurePending
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Wed Sep 22 00:56:33 2021
  ErrorMessage: installed grub-common package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2020-07-25 (423 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  ProcCmdLine: BOOT_IMAGE=/BOOT/ubuntu_8r9gw7@/vmlinuz-5.11.0-34-generic root=ZFS=rpool/ROOT/ubuntu_8r9gw7 ro quiet splash vt.handoff=1
  Python3Details: /usr/bin/python3.8, Python 3.8.10, 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  2.0.6
  SourcePackage: grub2
  Title: package grub-common 2.04-1ubuntu26.13 failed to install/upgrade: installed grub-common package post-installation script subprocess returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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