The error in your log is:
Setting up libpam0g:amd64 (1.1.8-1ubuntu2) ...
Can't load '/opt/perl/lib/x86_64-linux-gnu-thread-multi/auto/List/Util/Util.so'
for module List::Util:
/opt/perl/lib/x86_64-linux-gnu-thread-multi/auto/List/Util/Util.so: undefined
symbol: Perl_gv_init at /opt/perl/lib/x86_64-linux-gnu-thread-multi/XSLoader.pm
line 71.
at /opt/perl/lib/x86_64-linux-gnu-thread-multi/List/Util.pm line 21.
Compilation failed in require at
/opt/perl/lib/x86_64-linux-gnu-thread-multi/Scalar/Util.pm line 11.
Compilation failed in require at /usr/lib/perl/5.18/Hash/Util.pm line 9.
BEGIN failed--compilation aborted at /usr/lib/perl/5.18/Hash/Util.pm line 9.
Compilation failed in require at /opt/perl/lib/fields.pm line 123.
Compilation failed in require at /usr/share/perl5/Debconf/Log.pm line 10.
Compilation failed in require at /usr/share/perl5/Debconf/Db.pm line 7.
BEGIN failed--compilation aborted at /usr/share/perl5/Debconf/Db.pm line 7.
Compilation failed in require at /usr/share/debconf/frontend line 6.
BEGIN failed--compilation aborted at /usr/share/debconf/frontend line 6.
dpkg: error processing package libpam0g:amd64 (--configure):
subprocess installed post-installation script returned error exit status 255
Setting up libpam0g:i386 (1.1.8-1ubuntu2) ...
You have a corrupted install, with a non-Ubuntu-provided perl polluting
your environment. You will need to clear /opt/perl out of your path to
be able to upgrade.
** Changed in: pam (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1358438
Title:
package libpam-modules 1.1.8-1ubuntu2 failed to install/upgrade:
ErrorMessage: pre-dependency problem - not installing libpam-
modules:i386
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