My old desktops run Lubuntu (Ubuntu but lightweight!) 11.10, which just became part of the official Ubuntu release. Life is a lot zippier in Lubuntu compared to Ubuntu when you’re on Pentium III and Celeron machines.
I wanted to be able to login to these computers remotely with a GUI, sort of like Microsoft’s Remote Desktop but Linux style. I didn’t want VNC because I wanted to be able to create a new login session instead of using the main console. Luckily XDMCP does exactly that and most of it is built into Ubuntu.
Following one question previously posted on AskUbuntu, I proceeded to add the following snippet to /etc/lightdm/lightdm.conf:
Then following the procedures posted by David Winter, I opened Terminal on my Mac, and typed in:
/usr/X11R6/bin/X -query 192.168.0.1 (replace 192.168.0.1 with the IP address of your Lubuntu computer). After a few moments the Ubuntu login screen showed up. Perfect!
I made myself an alias so that I wouldn’t have to remember the complicated command line. In ~/.bash_profile, I added:
alias xdmcp="/usr/X11R6/bin/X -query"
So now I can start a XDMCP session by typing in