problem with clean purge and reinstall ksmserver-trinity

Hello as I wrote some time ago, I have a problem concerning the user managment in trinity. So finally I came to the conclusion that I have to purge the trinity installation completly and restart a fresh installation afterwards.. Howeven when running sudo apt-get purge name-of-trinity-pkg I obtain Removing ksmserver-trinity ... 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-trinity (--remove): subprocess installed post-removal script returned error exit status 2 Errors were encountered while processing: ksmserver-trinity E: Sub-process /usr/bin/dpkg returned an error code (1) What can I do? thanks Uwe Brauer