Hi Darren,
from your log:
modified.conffile..etc.postfix.post-install: [deleted]
modified.conffile..etc.postfix.postfix-files: [deleted]
modified.conffile..etc.postfix.postfix-script: [deleted]

I was able to reproduce by deleting those files.
So you need to decide to either remove postfix if you don#t want it e.g.

$ apt purge postfix

Or to reinstall the missing conffiles, for the latter see [1].

[1]: https://askubuntu.com/questions/66533/how-can-i-restore-
configuration-files

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https://bugs.launchpad.net/bugs/1709968

Title:
  package postfix 3.1.0-3 failed to install/upgrade: subprocess
  installed post-installation script returned error exit status 1

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