LightDM is installed and running by default as a part of the Beta release. Yet, LightDM is not displayed at login time, rather a primitive, GDM like manager is the one we find at login time.
I tried the command sudo dpkg-reconfigure lightdm
which gave the result :
dpkg-maintscript-helper: warning: environment variable DPKG_MAINTSCRIPT_NAME missing dpkg-maintscript-helper: warning: environment variable DPKG_MAINTSCRIPT_PACKAGE missing
sudo stop gdm gives stop: Unknown job: gdm (as GDM is not installed in the Beta Release)
sudo start lightdm gives start: Job is already running: lightdm
So now, how do we make LightDM appear at login time?