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I intent to buy a new Desktop PC, but I'm wondering if I can share one machine between 2 users. I read about the subject, however I didn't find any guide for that, only some isolated answers/comentaries. Then I tried to test it with my laptop that has only one video board, but after some tries that failed and killed my graphicall interface and at each try I had to reinstall my system, I gave up.

I know that LightDM does support multiseat, but it's only unlockable through editing lighdm.conf, there are not any graphicalleasytouseandfullofbuttons programs... and any instructions.

So the questions are:

  • Can I have a multiseat system using Ubuntu 11.10/12.04 with two video boards? And if so, HOW?

  • Can I have a multiseat using one video board? If so, HOW?

Thank you for the attention, Rodrigo Martins.

[EDIT] I've been trying to get something from these sources:

Support multi-seat

Configuration file for setup1


Virtual terminal switching with multiseat setup and lightdm

multiseat sample xorg.conf ati intel

I figured out more or less how to setup lightdm.conf for multiseat, but the problem now stands at xorg.conf, looking at the fourth and fifth links I had some idea of how to do the configuration, but I don't know how to call my second screen, that is connected to the VGA output , in the Section when it asks for the 'Identifier', 'Screen' and 'Monitor', is it just to put screen1 and monitor1? vga and vga-monitor?

Can you help me with this?

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The only reference I know of is here : I have no experience with this uncommon setup. – bodhi.zazen Dec 8 '11 at 1:00
Thanks, I already read that, but as far as I know that instructions are for GDM, not LightDM and the GDM you have to use is an older version, I don't want it. – Rodrigo Martins Dec 8 '11 at 13:39
Sorry that information was not helpful. – bodhi.zazen Dec 8 '11 at 16:05
@RodrigoMartins - what lightdm.conf options have you tried from this bug report? – fossfreedom Jan 8 '12 at 21:10
Have you seen this answer? – djeikyb Jan 10 '12 at 10:18

Multi-seat support for LightDM was discussed during development and a fix has been released for Oneiric:

Support multi-seat setup. This is (I think) when you run two sessions on a single X server (with two displays/keyboards/mice).

The basic configuration of lightdm.conf is

displays=display0 display1





The lead developer also gives this example in the report:


command=/usr/bin/X -foo

Thus for each video card you need to define an X-session (through xnest & xephir)

In the report a specific example of a xorg.conf file should support for multiple nvidia displays.

In terms with running multiple X sessions from one video card this is currently unsupported.

I hope this answer gives you some ideas to work through.

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You can create MultiSeat ubuntu system,with multiple user terminals and single CPU. you need to install Userful Multiplier in ubuntu, a detailed guide and step by step process can be found here

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Thanks for the answer, but Userful Multiplier is an old program, it runs natively on Ubuntu 8.10 and 9.10, on Ubuntu 10.04 it can be ran with great efforts, although I've asked for something on Ubuntu 11.04/11.10 and they use LightDM not GDM to run Userful. – Rodrigo Martins Jan 7 '12 at 16:24

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