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Lightdm can be used in a set-top box environment, ie starting a configured X session as a configured user; in this case all data will be retrieved from the config file.

Can lightdm work/be installed without any greeter, to minimise the footprint on such a minimal system?

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While this doesn't answer the question, nodm was specifically designed to address this use case. I'm unsure of present development status there. – Emmet Hikory Jul 11 '11 at 16:46
uxlaunch is the Ubuntu's answer for that as well, but it's not completely integrated with Plymouth yet. LightDM being the next standard supports Plymouth well already. – Luigi Capriotti Jul 12 '11 at 7:45

Yes, LightDM can run without any greeter. Set LightDM to automatically log in as the user / session required.

If you log out of the session however LightDM will try and start a greeter. This is planned to be fixed, see .

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