Comment 2 for bug 615865

Same behaviour for me

Black screen after login

I can't install "kubuntu-desktop" cause of some broken packages

Rename ~/.kde didn't work

In /var/log/syslog I had some messages like (sorry for typo):

acpid: 1client rule loaded
acpid: client 1051[0:0] has disconnected
init: plymouth main process (390) killed bi SEGV signal
kdm_greet[2160]: Data directory "/var/lib/kdm" not accessible: Permesso negato
kdm_greet[2160]: Cannot load /usr/share/kde4/apps/kdm/faces/.default.face: Nessun file o directory