package munin 2.0.57-1ubuntu1 failed to install/upgrade: installed munin package post-installation script subprocess returned error exit status 1

[Stuart Foulds-Duncan]

Do-Release-Upgrade failed from 20.04 to 20.10

ProblemType: Package
DistroRelease: Ubuntu 20.10
Package: munin 2.0.57-1ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-67.75-generic 5.4.94
Uname: Linux 5.4.0-67-generic x86_64
ApportVersion: 2.20.11-0ubuntu50.5
Architecture: amd64
CasperMD5CheckResult: skip
Date: Mon Mar 22 11:33:00 2021
ErrorMessage: installed munin package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2018-08-06 (959 days ago)
InstallationMedia:

PackageArchitecture: all
Python3Details: /usr/bin/python3.8, Python 3.8.6, python3-minimal, 3.8.6-0ubuntu1
PythonDetails: /usr/bin/python3.8, Python 3.8.6, python-is-python3, 3.8.2-4
RelatedPackageVersions:
 dpkg 1.20.5ubuntu2
 apt 2.1.10ubuntu0.2
SourcePackage: munin
Title: package munin 2.0.57-1ubuntu1 failed to install/upgrade: installed munin package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to groovy on 2021-03-22 (0 days ago)
mtime.conffile..etc.munin.apache24.conf: 2018-08-10T10:12:53.628816
mtime.conffile..etc.munin.munin.conf: 2018-08-10T10:13:57.183943

[Stuart Foulds-Duncan (karaokestu)]

Found out this was due to old versions of the init.d scripts.

No specific code was required there, so I removed the init.d scripts and it now works successfully