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
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Public bug reported:
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
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