I just installed a test machine with Ubuntu LTS 14.04 and I went to configure the XDMCP access and found that the file /etc/lightdm/lightdm.conf
is not there anymore.
In Google I found that now it is in /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf
and there I modified the settings to enable XDMCP and some others:
[SeatDefaults]
user-session=ubuntu
greeter-show-manual-login=true
[XDMCPServer]
enabled=true
[SeatDefaults]
xserver-allow-tcp=true
But when I try to log in using Xming from a windows machine, I can enter the username and password but afterwards no desktop appears, only the background from the login screen.