How to create a Remote Desktop Server on Ubuntu Server per user

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http://askubuntu.com – I want to create an old style server - thinclient/terminal kind of work with ubuntu server 12.04. I was trying to use x11vnc to serve remote desktops to users but from what I have understood [after couple of hours] it directly serves the x display of only one user. I want to have something like windows 2008 login where every user connects and logins to his own desktop and has his own working environment. Is it possible with ubuntu server ? Thank you (HowTos)