This defect may not be in lightdm package. I was just able to reproduce
it on Ubuntu 18.04.01 distribution. Here is how I did it.

I am using 18.04.01 with KDE.
I installed the skypeforlinux package
This package had unsatisfied dependency gnome-keyring as without it skype will 
not log in automatically.
I installed gnome-keyring and seahorse so that I can reset the keyring.
After these three I wasn't able to logout from my KDE session as I was logged 
back in.
It didn't help to uninstall skypeforlinux or seahorse. 
Only after I uninstalled gnome-keyring and restarted my computer I am able to 
normally logout from my KDE session.

On a side node now even after I log out, I can still see my session hanging 
around using
sudo loginctl
If I log in it till create second session as reported by the above command but 
at least I can logout reliably.


** Also affects: lightdm
   Importance: Undecided
       Status: New

** Also affects: gnome-keyring
   Importance: Undecided
       Status: New

** Also affects: skype
   Importance: Undecided
       Status: New

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

Title:
  lightdm automatically logs in after logout

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