Can't remove kde3

I've decided that on one of my machines I can use KDE4, so I'm trying to remove KDE3 on that system. One package won't uninstall and it is messing up my updates: $ sudo aptitude remove ksmserver-kde3 Reading package lists... Done Building dependency tree Reading state information... Done Reading extended state information Initializing package states... Done The following packages will be REMOVED: ksmserver-kde3 0 packages upgraded, 0 newly installed, 1 to remove and 13 not upgraded. Need to get 0B of archives. After unpacking 545kB will be freed. Writing extended state information... Done (Reading database ... 258178 files and directories currently installed.) Removing ksmserver-kde3 ... No diversion `any diversion of /usr/bin/plasma', none removed Removing `local diversion of /usr/bin/plasma-desktop to /usr/bin/plasma-desktop.kde4' dpkg-divert: rename involves overwriting `/usr/bin/plasma-desktop' with different file `/usr/bin/plasma-desktop.kde4', not allowed dpkg: error processing ksmserver-kde3 (--remove): subprocess post-removal script returned error exit status 2 Errors were encountered while processing: ksmserver-kde3 E: Sub-process /usr/bin/dpkg returned an error code (1) A package failed to install. Trying to recover: Reading package lists... Done Building dependency tree Reading state information... Done Reading extended state information Initializing package states... Done Anyone know how I can remove this package? Thanks, Michael