removing trinity

Hi, Trinity didn't install cleanly on my system , never worked correctly , and now I need to clean things up. we have highly customized systems using local package repos, the install failed and I forced the trinity install using dpkg on the advise of someone who "knew", so this should not be taken as a comment on trinity quality. My latest problem is that the uninstall is also failing, preventing me from switching back to kde4. Any advise on getting past this would be greatly appreciated. $sudo apt-get purge ksmserver-kde3 Reading package lists... Done Building dependency tree Reading state information... Done The following packages will be REMOVED: ksmserver-kde3 0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded. 1 not fully installed or removed. After this operation, 594kB disk space will be freed. Do you want to continue [Y/n]? Y (Reading database ... 468424 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 installed 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)