ldm 5.0.33 (amd64 binary) in ubuntu gutsy

 ldm is an X11 display manager similar to xdm, gdm and kdm, but unlike
 those it wraps the X11 traffic within an ssh tunnel to provide a
 secure login mechanism for remote X sessions. ldm provides access
 only through SSH, not locally. It is technically possible to use ldm
 to connect to the same host, but probably a waste of CPU power.
 .
 It was written to work with the LTSP project, but should work without
 LTSP as well.