for me, amd64-Packages work fine, i386-Packages not.i386-Packages have a trigger-file in /DEBIAN, containing the trigger "activate-noawait ldconfig", amd64-packages miss this file.
dpkg is of version 1.15.12 (i386), which seems to miss support for this kind of trigger.
My Workaround: I unpacked the package, commented the trigger out, repacked the package and was able to install it. Afterwards I ran ldconfig manually, just to be safe.
Michael Abmayer