Enable XDMCP on Ubuntu 11.10
root@blackbox:~# cp /etc/lightdm/lightdm.conf /etc/lightdm/lightdm.conf.$(date -I) root@blackbox:~# cat /etc/lightdm/lightdm.conf
[SeatDefaults] greeter-session=unity-greeter user-session=ubuntu [XDMCPServer] enabled=true root@blackbox:~#
Restart X display manager
root@blackbox:~# restart lightdm lightdm start/running, process 5684 root@blackbox:~#