It's not clear what the cause of this error is.  Your upgrade log shows
some debconf errors, followed by a non-fatal pam-auth-update message:

Setting up libpam-runtime (1.1.3-2ubuntu1) ...
Use of uninitialized value $ret in scalar chomp at /usr/share/perl5/Debconf/Clie
nt/ConfModule.pm line 132, <STDIN> line 7.
Use of uninitialized value $ret in split at /usr/share/perl5/Debconf/Client/Conf
Module.pm line 133, <STDIN> line 7.
Use of uninitialized value $ret[0] in string eq at /usr/share/perl5/Debconf/Clie
nt/ConfModule.pm line 134, <STDIN> line 7.
Use of uninitialized value $ret in scalar chomp at /usr/share/perl5/Debconf/Clie
nt/ConfModule.pm line 132, <STDIN> line 7.
Use of uninitialized value $ret in split at /usr/share/perl5/Debconf/Client/Conf
Module.pm line 133, <STDIN> line 7.
Use of uninitialized value $ret[0] in string eq at 
/usr/share/perl5/Debconf/Client/ConfModule.pm line 134, <STDIN> line 7.
Use of uninitialized value in string eq at /usr/sbin/pam-auth-update line 161, 
<STDIN> line 7.
pam-auth-update: Local modifications to /etc/pam.d/common-*, not updating.
pam-auth-update: Run pam-auth-update --force to override.
dpkg: error processing libpam-runtime (--configure):
 subprocess installed post-installation script returned error exit status 1

Is this problem reproducible , or did it resolve itself upon
reattempting the upgrade?  What is the output of the command 'debconf-
show libpam-runtime' run from a terminal?

The pam message indicates that you have edited by /etc/pam.d/common-* by
hand.  Is this correct?  Is there any particular reason you've done
this?

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

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https://bugs.launchpad.net/bugs/879131

Title:
  package libpam-runtime 1.1.3-2ubuntu1 failed to install/upgrade:
  ErrorMessage: subprocess installed post-installation script returned
  error exit status 1

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