package firmware-b43-installer 1:019-6 failed to install/upgrade: installed firmware-b43-installer package post-installation script subprocess returned error exit status 1

[Bill (franksmcb)]

Upgrading system from Ubuntu MATE 20.04 to Ubuntu MATE 20.10 via Alt+F2 and then update-manager -c

Updates begins but error shows with Could not install 'firmware-b43-installer' (Screenshot attached)

Upgrade completes but shows error message "Upgrade could not be installed, system may be unusable"

System shows that the firmware is installed: firmware-b43-installer/groovy,groovy,now 1:019-6 all [installed]
  firmware installer for the b43 driver

ProblemType: Package
DistroRelease: Ubuntu 20.10
Package: firmware-b43-installer 1:019-6
ProcVersionSignature: Ubuntu 5.8.0-26.27-generic 5.8.14
Uname: Linux 5.8.0-26-generic x86_64
ApportVersion: 2.20.11-0ubuntu50
Architecture: amd64
CasperMD5CheckResult: skip
Date: Sat Nov 7 17:22:21 2020
ErrorMessage: installed firmware-b43-installer package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2019-04-25 (562 days ago)
InstallationMedia: Ubuntu-MATE 19.04 "Disco Dingo" - Release amd64 (20190416)
PackageArchitecture: all
Python3Details: /usr/bin/python3.8, Python 3.8.6, python3-minimal, 3.8.6-0ubuntu1
PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
RelatedPackageVersions:
 dpkg 1.20.5ubuntu2
 apt 2.1.10
SourcePackage: b43-fwcutter
Title: package firmware-b43-installer 1:019-6 failed to install/upgrade: installed firmware-b43-installer package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to groovy on 2020-11-08 (0 days ago)

[Launchpad Janitor (janitor)]

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

[Launchpad Janitor (janitor)]

[Expired for b43-fwcutter (Ubuntu) because there has been no activity for 60 days.]