FYI - I was able to do a normal DU a short time ago. There was one perl file removed, with a new one installed in it's place. One package (xserver-xorg-core) was held by the system - not by action on my part. Your mileage may vary, of course, read everything before you proceed.
Remove: libperl5.14:amd64 (5.14.2-21)
Install: libperl5.18:amd64 (5.18.1-2, automatic)