https://dennistt.net/2012/02/08/xdmcp-login-from-mac-to-lubuntu-11-10/?amp
XDMCP Login from Mac to Lubuntu 11.10 - Dennis Tsang
Feb 10, 2013 - 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...
xdmcpmaclubuntudennistsang