apt-get holds back 10 kde packages

Hello List, I wanted to upgrade to 3.1.4 with apt-get, but it wants to keep back 10(!) kde packages: kdeadmin3 kdeedu3 kdegames3 kdegraphics3 kdelibs3 kdelibs3-devel kdemultimedia3-devel kdepim3 kdetoys3 libwmf Since this includes some core packages, I aborted the upgrade. I assume there are dependencies from some packages I installed separately. Can I find out what packages are causing this? Maybe uninstalling those packages by hand, upgrading, and re-installing would help. Kostas