It looks more like a debconf issue to me:

Preparing to unpack .../1-postfix_3.3.0-1_amd64.deb ...
Gtk-Message: 20:19:38.211: 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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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

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