I would regard this as a bug, only in that there should be some 
detection of this status and appropriate messaging rather than just a 
blanket couldn't upgrade.  It seems fairly likely that a Dovecot 
installation would have a customized certificate.  To be honest, the 
customization of this package happened so long ago that I had forgotten 
that I had installed my own certificate so it made it doubly baffling.

Just saying, but thanks for the response and your hard work.

Peter

On 1/11/21 5:54 AM, Christian Ehrhardt  wrote:
> Thank you for taking the time to report this bug and helping to make
> Ubuntu better.
>
> On upgrading a service this service has to be restarted to pick up the fixes.
> Rather rarely a real issue occurs that the newer version does e.g. fail with 
> the formerly working configuration.
> But most of the time what happens is, that a service was installed, but stays 
> unconfigured or experimented with but left in a broken state.
>
> Now on any update of the related packages that service has to be restarted, 
> but since its config is incomplete/faulty it fails to restart.
> Therefore the update of that package has to consider itself incomplete.
>
> Depending on your particular case there are two solutions:
> - either remove the offending package if you don't want to continue using it.
> - Or if you do want to keep it please fix the configuration so that 
> re-starting the service will work.
>
> Since it seems likely to me that this is a local configuration problem,
> rather than a bug in Ubuntu, I'm marking this bug as Incomplete.
>
> If indeed this is a local configuration problem, you can find pointers
> to get help for this sort of problem here:
> http://www.ubuntu.com/support/community
>
> Or if you believe that this is really a bug, then you may find it
> helpful to read "How to report bugs effectively"
> http://www.chiark.greenend.org.uk/~sgtatham/bugs.html. We'd be grateful
> if you would then provide a more complete description of the problem,
> explain why you believe this is a bug in Ubuntu rather than a problem
> specific to your system, and then change the bug status back to New.
>
> ** Changed in: dovecot (Ubuntu)
>         Status: New => Incomplete
>

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https://bugs.launchpad.net/bugs/1910818

Title:
  package dovecot-core 1:2.3.11.3+dfsg1-2ubuntu0.1 failed to
  install/upgrade: installed dovecot-core package post-installation
  script subprocess returned error exit status 1

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