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

[tautao]

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)

[Mate Kukri (mkukri)]

looks like a corrupted grub environment block. unfortunately hard to tell why from this.

If you are still having this issue, please report a new bug.