Public bug reported:
I tried the first 3 methods in the following article to no avail:
https://itsfoss.com/dpkg-returned-an-error-code-1/
dpkg: error processing package grub-pc (--configure):
installed grub-pc package post-installation script subprocess returned error
exit status 20
Errors were encountered while processing:
grub-pc
E: Sub-process /usr/bin/dpkg returned an error code (1)
ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: grub-efi-amd64 (not installed)
ProcVersionSignature: Ubuntu 5.13.0-1021.24~20.04.1-azure 5.13.19
Uname: Linux 5.13.0-1021-azure x86_64
ApportVersion: 2.20.11-0ubuntu27.21
AptOrdering:
grub-gfxpayload-lists:amd64: Remove
grub-pc:amd64: Remove
grub-efi-amd64:amd64: Install
NULL: ConfigurePending
Architecture: amd64
CasperMD5CheckResult: skip
Date: Sun Apr 10 08:46:57 2022
DpkgTerminalLog:
Preparing to unpack .../grub-efi-amd64_2.04-1ubuntu44.2_amd64.deb ...
Unpacking grub-efi-amd64 (2.04-1ubuntu44.2) ...
Setting up grub-efi-amd64 (2.04-1ubuntu44.2) ...
[1mdpkg:[0m error processing package grub-efi-amd64 (--configure):
installed grub-efi-amd64 package post-installation script subprocess returned
error exit status 128
ErrorMessage: installed grub-efi-amd64 package post-installation script
subprocess returned error exit status 128
InstallationDate: Installed on 2022-01-29 (70 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64
(20210209.1)
Python3Details: /usr/bin/python3.8, Python 3.8.10, python3-minimal,
3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions:
dpkg 1.19.7ubuntu3
apt 2.0.6
SourcePackage: grub2-unsigned
Title: package grub-efi-amd64 (not installed) failed to install/upgrade:
installed grub-efi-amd64 package post-installation script subprocess returned
error exit status 128
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: grub2-unsigned (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-package focal
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https://bugs.launchpad.net/bugs/1968470
Title:
Apt update fails on package grub-pc. package grub-efi-amd64 (not
installed) failed to install/upgrade: installed grub-efi-amd64 package
post-installation script subprocess returned error exit status 128
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