Run the following
apt-get install kdm
Edit /etc/kde3/kdm/kdmrc
[Xdmcp]
Enable=true
Edit /etc/kde3/kdm/Xservers and comment out the local Xserver invocation
#:0 local@tty1
/usr/X11R6/bin/X
-nolisten tcp
#:1 local@tty2 reserve /usr/X11R6/bin/X -nolisten tcp :1
#:2 local@tty3 reserve /usr/X11R6/bin/X
-nolisten tcp :2
#:3 local@tty4 reserve /usr/X11R6/bin/X -nolisten tcp :3
#:4 local@tty5 reserve /usr/X11R6/bin/X -nolisten tcp :4
Edit /etc/kde3/kdm/Xaccess and uncomment the following line
*
#any
host can get a login window
Make sure that kdm is the default window manager
/usr/sbin/update-rc.d kdm
defaults
Also make sure that it is in /etc/X11/default-window-manager
/usr/bin/kdm
Restart coLinux