It looks more like a debconf issue to me:
Preparing to unpack .../1-postfix_3.3.0-1_amd64.deb ...
Gtk-[1;32mMessage[0m: [34m20:19:38.211[0m: GtkDialog mapped without a
transient parent. This is discouraged.
Use of uninitialized value $ret in scalar chomp at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 132, <STDIN> line 5.
Use of uninitialized value $ret in split at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 133, <STDIN> line 5.
Use of uninitialized value $ret[0] in string eq at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 134, <STDIN> line 5.
Use of uninitialized value $ret in scalar chomp at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 132, <STDIN> line 5.
Use of uninitialized value $ret in split at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 133, <STDIN> line 5.
Use of uninitialized value $ret[0] in string eq at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 134, <STDIN> line 5.
Use of uninitialized value in numeric eq (==) at /var/lib/dpkg/tmp.ci/config
line 55, <STDIN> line 5.
Use of uninitialized value $ret in scalar chomp at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 132, <STDIN> line 5.
Use of uninitialized value $ret in split at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 133, <STDIN> line 5.
Use of uninitialized value $ret[0] in string eq at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 134, <STDIN> line 5.
Use of uninitialized value $mailertype in string eq at
/var/lib/dpkg/tmp.ci/config line 57, <STDIN> line 5.
Use of uninitialized value $ret in scalar chomp at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 132, <STDIN> line 5.
Use of uninitialized value $ret in split at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 133, <STDIN> line 5.
Use of uninitialized value $ret[0] in string eq at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 134, <STDIN> line 5.
Use of uninitialized value $ret in scalar chomp at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 132, <STDIN> line 5.
Use of uninitialized value $ret in split at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 133, <STDIN> line 5.
Use of uninitialized value $ret[0] in string eq at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 134, <STDIN> line 5.
Use of uninitialized value $ret in scalar chomp at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 132, <STDIN> line 5.
Use of uninitialized value $ret in split at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 133, <STDIN> line 5.
Use of uninitialized value $ret[0] in string eq at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 134, <STDIN> line 5.
Use of uninitialized value $mailertype in string eq at
/var/lib/dpkg/tmp.ci/config line 67, <STDIN> line 5.
Use of uninitialized value $mailertype in string eq at
/var/lib/dpkg/tmp.ci/config line 67, <STDIN> line 5.
Use of uninitialized value $mailertype in string eq at
/var/lib/dpkg/tmp.ci/config line 67, <STDIN> line 5.
Use of uninitialized value $ret in scalar chomp at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 132, <STDIN> line 5.
Use of uninitialized value $ret in split at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 133, <STDIN> line 5.
Use of uninitialized value $ret[0] in string eq at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 134, <STDIN> line 5.
Use of uninitialized value $ret in scalar chomp at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 132, <STDIN> line 5.
Use of uninitialized value $ret in split at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 133, <STDIN> line 5.
Use of uninitialized value $ret[0] in string eq at
/usr/share/perl5/Debconf/Client/ConfModule.pm line 134, <STDIN> line 5.
dpkg: error processing archive
/tmp/apt-dpkg-install-0R1mHg/1-postfix_3.3.0-1_amd64.deb (--unpack):
new postfix package pre-installation script subprocess returned error exit
status 1
** Package changed: postfix (Ubuntu) => debconf (Ubuntu)
** Changed in: debconf (Ubuntu)
Status: Invalid => New
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Touch seeded packages, which is subscribed to debconf in Ubuntu.
https://bugs.launchpad.net/bugs/1773200
Title:
package postfix (not installed) failed to install/upgrade: new postfix
package pre-installation script subprocess returned error exit status
1
Status in debconf package in Ubuntu:
New
Bug description:
A window about the error have just appeared when trying to install a
soft by Synaptic
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)
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