Can you look through the /var/log/dist-upgrade/apt-term.log and post the lines that come from the upgrade of the slapd package?
(I don't know off hand if any of the discussion there applies in the Lucid-to-Mavick upgrade case, but in case it's helpful I'll point you to LP #536958, which covers the similar bug I ran into when upgrading from Hardy to Lucid.)
Can you look through the /var/log/ dist-upgrade/ apt-term. log and post the lines that come from the upgrade of the slapd package?
(I don't know off hand if any of the discussion there applies in the Lucid-to-Mavick upgrade case, but in case it's helpful I'll point you to LP #536958, which covers the similar bug I ran into when upgrading from Hardy to Lucid.)