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c't ran an article on such a Linux multi-seat setup some years back, possibly more than 6-7 years ago. AFAIR, without virtualization.
Way back in 2006: c't 10/2006, page 228 There was also a more recent one: c't 5/2013, page 158. Only 2.5 pages for setting up a 2-seat system, seems straight forward (although with Ubuntu). Not as easy as you think. You have to have a displaymanager which can allocate the various mice/keyboards and screens to each session. Only very recent releases of displaymanagers have this capability. The contents of this email are confidential and for the exclusive use of the intended recipient. If you receive this email in error you should not copy it, retransmit it, use it or disclose its contents but should return it to the sender immediately and delete your copy.