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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