Preparing to unpack .../libpam-runtime_1.4.0-11ubuntu2.3_all.deb ...
Unpacking libpam-runtime (1.4.0-11ubuntu2.3) over (1.4.0-11ubuntu2) ...
Setting up libpam-runtime (1.4.0-11ubuntu2.3) ...
Use of uninitialized value $ret in string eq at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 134.
dpkg: error processing package libpam-runtime (--configure):
 installed libpam-runtime package post-installation script subprocess returned error exit status 128