Wondering if this might be an apparmor issue.
This is what apt/dpkg tells us...
Setting up slapd (2.4.17-1ubuntu2) ...
Backing up /etc/ldap/slapd.d/ in /var/backups/slapd-2.4.15-1.1ubuntu1...
done.
Cached reload succeeded for /etc/apparmor.d/cache/usr.sbin.slapd.
Starting OpenLDAP:
fixed in AppArmor 2.3.1+1403-0ubuntu7
** Changed in: openldap (Ubuntu)
Status: Incomplete = Fix Released
** Package changed: openldap (Ubuntu) = apparmor (Ubuntu)
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package slapd 2.4.17-1ubuntu2 failed to install/upgrade: subprocess installed
post-installation script returned error
** Attachment added: AptOrdering.txt
http://launchpadlibrarian.net/29812122/AptOrdering.txt
** Attachment added: Dependencies.txt
http://launchpadlibrarian.net/29812128/Dependencies.txt
** Attachment added: Dmesg.txt
http://launchpadlibrarian.net/29812129/Dmesg.txt
** Attachment