/usr/share/kde4/apps/kdm/sessions/ is in kdm 4:4.8.5-0ubuntu0.4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/kde4/apps/kdm/sessions/9wm.desktop
/usr/share/kde4/apps/kdm/sessions/aewm++.desktop
/usr/share/kde4/apps/kdm/sessions/aewm.desktop
/usr/share/kde4/apps/kdm/sessions/afterstep.desktop
/usr/share/kde4/apps/kdm/sessions/amaterus.desktop
/usr/share/kde4/apps/kdm/sessions/amiwm.desktop
/usr/share/kde4/apps/kdm/sessions/asclassic.desktop
/usr/share/kde4/apps/kdm/sessions/blackbox.desktop
/usr/share/kde4/apps/kdm/sessions/cde.desktop
/usr/share/kde4/apps/kdm/sessions/ctwm.desktop
/usr/share/kde4/apps/kdm/sessions/cwwm.desktop
/usr/share/kde4/apps/kdm/sessions/e16.desktop
/usr/share/kde4/apps/kdm/sessions/enlightenment.desktop
/usr/share/kde4/apps/kdm/sessions/evilwm.desktop
/usr/share/kde4/apps/kdm/sessions/fluxbox.desktop
/usr/share/kde4/apps/kdm/sessions/flwm.desktop
/usr/share/kde4/apps/kdm/sessions/fvwm.desktop
/usr/share/kde4/apps/kdm/sessions/fvwm95.desktop
/usr/share/kde4/apps/kdm/sessions/gnome.desktop
/usr/share/kde4/apps/kdm/sessions/golem.desktop
/usr/share/kde4/apps/kdm/sessions/icewm.desktop
/usr/share/kde4/apps/kdm/sessions/ion.desktop
/usr/share/kde4/apps/kdm/sessions/kde-plasma-safe.desktop
/usr/share/kde4/apps/kdm/sessions/kde-plasma.desktop
/usr/share/kde4/apps/kdm/sessions/larswm.desktop
/usr/share/kde4/apps/kdm/sessions/lwm.desktop
/usr/share/kde4/apps/kdm/sessions/matchbox.desktop
/usr/share/kde4/apps/kdm/sessions/metacity.desktop
/usr/share/kde4/apps/kdm/sessions/mwm.desktop
/usr/share/kde4/apps/kdm/sessions/olvwm.desktop
/usr/share/kde4/apps/kdm/sessions/olwm.desktop
/usr/share/kde4/apps/kdm/sessions/openbox.desktop
/usr/share/kde4/apps/kdm/sessions/oroborus.desktop
/usr/share/kde4/apps/kdm/sessions/phluid.desktop
/usr/share/kde4/apps/kdm/sessions/pwm.desktop
/usr/share/kde4/apps/kdm/sessions/qvwm.desktop
/usr/share/kde4/apps/kdm/sessions/ratpoison.desktop
/usr/share/kde4/apps/kdm/sessions/sapphire.desktop
/usr/share/kde4/apps/kdm/sessions/sawfish.desktop
/usr/share/kde4/apps/kdm/sessions/twm.desktop
/usr/share/kde4/apps/kdm/sessions/ude.desktop
/usr/share/kde4/apps/kdm/sessions/vtwm.desktop
/usr/share/kde4/apps/kdm/sessions/w9wm.desktop
/usr/share/kde4/apps/kdm/sessions/waimea.desktop
/usr/share/kde4/apps/kdm/sessions/wm2.desktop
/usr/share/kde4/apps/kdm/sessions/wmaker.desktop
/usr/share/kde4/apps/kdm/sessions/xfce.desktop
/usr/share/kde4/apps/kdm/sessions/xfce4.desktop