[Bug 1773200] [NEW] package postfix (not installed) failed to install/upgrade: new postfix package pre-installation script subprocess returned error exit status 1

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ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: postfix (not installed)
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
Date: Thu May 24 20:20:09 2018
ErrorMessage: new postfix package pre-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2018-05-22 (1 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt  1.6.1
SourcePackage: postfix
Title: package postfix (not installed) failed to install/upgrade: new postfix package pre-installation script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: debconf (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-package bionic
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package postfix (not installed) failed to install/upgrade: new postfix package pre-installation script subprocess returned error exit status 1
https://bugs.launchpad.net/bugs/1773200
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