package grub-efi-amd64-signed 1.173.4+2.04-1ubuntu47.5 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 32

[Peter Barada]

updating grub on RAID1 disks; see https://askubuntu.com/questions/1299978/install-ubuntu-20-04-desktop-with-raid-1-and-lvm-on-machine-with-uefi-bios for original installation steps to create LVM on RAID1 to install Ubuntu Desktop version(didn't want to install Ubuntu server version).

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: grub-efi-amd64-signed 1.173.4+2.04-1ubuntu47.5
ProcVersionSignature: Ubuntu 5.15.0-56.62~20.04.1-generic 5.15.64
Uname: Linux 5.15.0-56-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.25
Architecture: amd64
CasperMD5CheckResult: skip
Date: Fri Jan 13 12:31:32 2023
DuplicateSignature:
 package:grub-efi-amd64-signed:1.173.4+2.04-1ubuntu47.5
 Setting up grub-efi-amd64-signed (1.173.4+2.04-1ubuntu47.5) ...
 mount: /var/lib/grub/esp: special device /, does not exist.
 dpkg: error processing package grub-efi-amd64-signed (--configure):
  installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 32
ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 32
InstallationDate: Installed on 2022-03-26 (292 days ago)
InstallationMedia: Ubuntu 20.04.4 LTS "Focal Fossa" - Release amd64 (20220223)
Python3Details: /usr/bin/python3.8, Python 3.8.10, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: /usr/bin/python2.7, Python 2.7.18, unpackaged
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3.2
 apt 2.0.9
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.173.4+2.04-1ubuntu47.5 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 32
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.