I resolved this by disabling one of the duplicate services with:
statusctl disable rc.local.service
A reboot confirms it to have fixed the problem with no (apparent) ill
effect.
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Posting to reporting I have exactly the same issue having recently
upgraded from 18.04.5 LTS to 20.04.1 LTS. Incidentally, I had previously
upgraded from 16.04 LTS too.
Any guidance how to remove the duplicate execution?
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Public bug reported:
System: Ubuntu 18.04.2 LTS
Using Aptitude I updated Dovecot (specifically dovecot-core:amd64) from
1:2.2.33.2-1ubuntu4.2 -> 1:2.2.33.2-1ubuntu4.3 and ended up with a non-
working installation. The reason for this is that the following config
files were completely overwritten
