Debian upgrade

Since my wife prefers kde3 to kde4, I have kept lenny on her machine. Fortunately, with the upgrade to squeeze imminent, I found trinity. The install in lenny was smooth, but then I changed my apt.conf to point to testing and changed the trinity.list to point to , and if I do an apt-get dist-upgrade, it wants to deinstall all of trinity. aptitude full-upgrade spits out pages and pages of dependency problems, things which I would think would be upgraded in a dist- (or full-) upgrade. What is the proper path to upgrading a Debian box with trinity installed? I would like to get at least to testing, but would really prefer getting to sid, if trinity from squeeze will run there. Thanks, --b