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Ubuntu 18.04 freeze on login screen, shutdown and restart - GDM vs LightDM? (2 Solutions!!) - YouTube
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LightDM To Be Default Display Manager In Ubuntu 11.10 Oneiric Ocelot [UDS] ~ Web Upd8: Ubuntu / Linux blog
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How To Switch Between GDM, LightDM, MDM Or KDM In Ubuntu [Quick Tip] ~ Web Upd8: Ubuntu / Linux blog
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