Preparing to unpack .../systemd-sysv_232-21ubuntu4_amd64.deb ...
Unpacking systemd-sysv (232-21ubuntu4) over (232-21ubuntu3) ...
Preparing to unpack .../nplan_0.23~17.04.1_amd64.deb ...
Unpacking nplan (0.23~17.04.1) over (0.20) ...
Preparing to unpack .../openssh-client_1%3a7.4p1-10ubuntu0.1_amd64.deb ...
Unpacking openssh-client (1:7.4p1-10ubuntu0.1) over (1:7.4p1-10) ...
Preparing to unpack .../snapd_2.26.4+17.04_amd64.deb ...
Warning: Stopping snapd.service, but it can still be activated by:
  snapd.socket
Unpacking snapd (2.26.4+17.04) over (2.25+17.04) ...
Processing triggers for mime-support (3.60ubuntu1) ...
Processing triggers for ureadahead (0.100.0-19) ...
Setting up systemd-sysv (232-21ubuntu4) ...
Processing triggers for libc-bin (2.24-9ubuntu2) ...
Setting up udev (232-21ubuntu4) ...
addgroup: The group `input' already exists as a system group. Exiting.
update-initramfs: deferring update (trigger activated)
Setting up nplan (0.23~17.04.1) ...
Setting up libnss-resolve:amd64 (232-21ubuntu4) ...
Processing triggers for man-db (2.7.6.1-2) ...
Processing triggers for dbus (1.10.10-1ubuntu2) ...
Setting up openssh-client (1:7.4p1-10ubuntu0.1) ...
Setting up libpam-systemd:amd64 (232-21ubuntu4) ...
Use of uninitialized value $reply in scalar chomp at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 66.
Use of uninitialized value $reply in concatenation (.) or string at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 67.
Use of uninitialized value $reply in split at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 68.
Use of uninitialized value $reply in scalar chomp at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 66.
Use of uninitialized value $reply in concatenation (.) or string at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 67.
Use of uninitialized value $reply in split at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 68.
Use of uninitialized value $ret in string eq at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 109.
Use of uninitialized value $reply in scalar chomp at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 66.
Use of uninitialized value $reply in concatenation (.) or string at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 67.
Use of uninitialized value $reply in split at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 68.
Use of uninitialized value $reply in scalar chomp at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 66.
Use of uninitialized value $reply in concatenation (.) or string at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 67.
Use of uninitialized value $reply in split at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 68.
Use of uninitialized value $reply in scalar chomp at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 66.
Use of uninitialized value $reply in concatenation (.) or string at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 67.
Use of uninitialized value $reply in split at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 68.
dpkg: error processing package libpam-systemd:amd64 (--configure):
 subprocess installed post-installation script returned error exit status 128
Setting up snapd (2.26.4+17.04) ...