Hi, I have the same pb. on my ubuntu xenial,
here's what I get in the "lightdm.service" journal :

$ journalctl -au lightdm -S "2020-01-29 1:59"
-- Logs begin at lun. 2020-01-27 11:14:43 CET, end at mer. 2020-01-29 02:01:47 
CET. --
janv. 29 01:59:45 sebastien-B206 lightdm[11808]: Failed to write utmpx: 
Permission denied
janv. 29 01:59:45 sebastien-B206 lightdm[11808]: Error writing to daemon: Bad 
file descriptor
janv. 29 01:59:45 sebastien-B206 lightdm[11808]: Error writing to daemon: Bad 
file descriptor
janv. 29 01:59:45 sebastien-B206 lightdm[11808]: Error writing to daemon: Bad 
file descriptor
janv. 29 01:59:45 sebastien-B206 lightdm[11808]: Failed to write utmpx: 
Permission denied

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https://bugs.launchpad.net/bugs/1782510

Title:
  lightdm automatically logs in after logout

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