[Bug 1556660] [NEW] package postfix 2.11.3-1ubuntu2 failed to install/upgrade: subprocess new pre-installation script returned error exit status 1

[Vertago1]

*** This bug is a duplicate of bug 1531299 ***
    https://bugs.launchpad.net/bugs/1531299

Public bug reported:

postfix wasn't being used on the machine but was installed for a
dependency

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: postfix 2.11.3-1ubuntu2
ProcVersionSignature: Ubuntu 4.2.0-30.36-generic 4.2.8-ckt3
Uname: Linux 4.2.0-30-generic x86_64
NonfreeKernelModules: vboxpci vboxnetadp vboxnetflt vboxdrv fglrx
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
Date: Sun Mar 13 14:14:04 2016
DuplicateSignature: InvalidHostOrDomain
ErrorMessage: subprocess new pre-installation script returned error exit status 1
EtcMailname: *** /etc/mailname does not exist ***
Hostname: vertago1-FX8350
InstallationDate: Installed on 2014-04-11 (702 days ago)
InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326.2)
PostconfMydomain: Error: command ['/usr/sbin/postconf', '-h', 'mydomain'] failed with exit code 1: /usr/sbin/postconf: fatal: open /etc/postfix/main.cf: No such file or directory
PostconfMyhostname: Error: command ['/usr/sbin/postconf', '-h', 'myhostname'] failed with exit code 1: /usr/sbin/postconf: fatal: open /etc/postfix/main.cf: No such file or directory
PostconfMyorigin: Error: command ['/usr/sbin/postconf', '-h', 'myorigin'] failed with exit code 1: /usr/sbin/postconf: fatal: open /etc/postfix/main.cf: No such file or directory
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1
 apt  1.2.4
ResolvConf:
 # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
 #     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
 nameserver 127.0.1.1
SourcePackage: postfix
Title: package postfix 2.11.3-1ubuntu2 failed to install/upgrade: subprocess new pre-installation script returned error exit status 1
UpgradeStatus: Upgraded to xenial on 2016-03-13 (0 days ago)

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


** Tags: amd64 apport-package xenial

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https://bugs.launchpad.net/bugs/1556660

Title:
  package postfix 2.11.3-1ubuntu2 failed to install/upgrade: subprocess
  new pre-installation script returned error exit status 1

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