VBox Ubuntu 18 upgrade to 20 failed on grub setup

[Mileta]

Oracle VirtualBox machine with Ubuntu 18.04 LTS installed and tried to update to next LTS version 20.04.5 LTS

Upgrade commands used:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade

update-manager -c

Failed on the grub question. Popup screen could not accept input. The terminal status window did but still did not recognize the drive choice.

System upgrade completed and restart worked but upon restart this error log remained.
I did not expect the use of a virtual drive to fail the install near the end of the process. A warning up front if this cannot be avoided is expected.

Suspected issues with 20.04 LTS and VirtualBox as fresh install would not recognize the Oracle VBox GAS addon install. Attempted to perform an update of the last LTS with those addons already installed.

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: grub-pc 2.04-1ubuntu26.15
ProcVersionSignature: Ubuntu 5.4.0-126.142~18.04.1-generic 5.4.203
Uname: Linux 5.4.0-126-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.24
Architecture: amd64
CasperMD5CheckResult: skip
Date: Tue Sep 20 19:50:37 2022
ErrorMessage: installed grub-pc package post-installation script subprocess was killed by signal (Aborted)
InstallationDate: Installed on 2022-09-20 (0 days ago)
InstallationMedia: Ubuntu 18.04.6 LTS "Bionic Beaver" - Release amd64 (20210915)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-126-generic root=UUID=8be82ae3-a284-4f81-b1f3-3958d47b5313 ro quiet splash
Python3Details: /usr/bin/python3.8, Python 3.8.10, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3.2
 apt 2.0.9
SourcePackage: grub2
Title: package grub-pc 2.04-1ubuntu26.15 failed to install/upgrade: installed grub-pc package post-installation script subprocess was killed by signal (Aborted)
UpgradeStatus: Upgraded to focal on 2022-09-20 (0 days ago)

[Launchpad Janitor (janitor)]

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