Thanks for your report.

The relevant error is
===
Unpacking postfix (from .../postfix_2.5.5-1.1_i386.deb) ...
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 54, <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 56, <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 65, <STDIN> line 5.
Use of uninitialized value $mailertype in string eq at 
/var/lib/dpkg/tmp.ci/config line 65, <STDIN> line 5.
Use of uninitialized value $mailertype in string eq at 
/var/lib/dpkg/tmp.ci/config line 65, <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 /var/cache/apt/archives/postfix_2.5.5-1.1_i386.deb 
(--unpack):
 subprocess pre-installation script returned error exit status 1
===

It looks like a debconf issue. reaffecting to it.

- Could you please describe the steps you followed to produce this error ?
- Which package manager were you using to install postfix (update-manager, apt, 
aptitude, synaptic, ... ) ?
- Is it reproducible ?

Thanks.

** Package changed: synaptic (Ubuntu) => debconf (Ubuntu)

** Changed in: debconf (Ubuntu)
       Status: New => Incomplete

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