package oscar 1.0.1-r1 failed to install/upgrade: package is in a very bad inconsistent state; you should reinstall it before attempting configuration

[L. John Collier]

I upgraded to 20.04 and during the upgrade a note appeared on screen to the effect that Oscar 1.0.1 is in a very bad inconsistent state.
I went to re-install the package and got the same message and an invitation to submit a bug report.
Here I am . . .

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: oscar 1.0.1-r1
ProcVersionSignature: Ubuntu 5.4.0-47.51-generic 5.4.55
Uname: Linux 5.4.0-47-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.8
AptOrdering: NULL: ConfigurePending
Architecture: amd64
CasperMD5CheckResult: skip
Date: Wed Sep 9 11:11:09 2020
DpkgTerminalLog:
 dpkg: error processing package oscar (--configure):
  package is in a very bad inconsistent state; you should
  reinstall it before attempting configuration
ErrorMessage: package is in a very bad inconsistent state; you should reinstall it before attempting configuration
InstallationDate: Installed on 2020-01-13 (239 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: /usr/bin/python2.7, Python 2.7.18rc1, python-is-python2, 2.7.17-4
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.2ubuntu0.1
SourcePackage: oscar
Title: package oscar 1.0.1-r1 failed to install/upgrade: package is in a very bad inconsistent state; you should reinstall it before attempting configuration
UpgradeStatus: Upgraded to focal on 2020-09-08 (0 days ago)

[Launchpad Janitor (janitor)]

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