So I've just restarted the lightdm.service :
$ sudo service lightdm restart
$ service lightdm status
● lightdm.service - Light Display Manager
Loaded: loaded (/lib/systemd/system/lightdm.service; enabled; vendor preset:
enabled)
Active: active (running) since Wed 2020-01-29 02:09:37 CET; 13s ago
Docs: man:lightdm(1)
Process: 15476 ExecStartPre=/bin/sh -c [ "$(basename $(cat
/etc/X11/default-display-manager 2>/dev/null))" = "lightdm" ] (code=exited,
status=0/SUCCESS)
Main PID: 15480 (lightdm)
CGroup: /system.slice/lightdm.service
├─15480 /usr/sbin/lightdm
├─15490 /usr/lib/xorg/Xorg -core :0 -seat seat0 -auth
/var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
└─15618 lightdm --session-child 12 19
Jan 29 02:09:37 sebastien-B206 systemd[1]: Starting Light Display Manager...
Jan 29 02:09:37 sebastien-B206 systemd[1]: Started Light Display Manager.
Jan 29 02:09:38 sebastien-B206 lightdm[15522]:
pam_kwallet(lightdm-greeter:setcred): (null): pam_sm_setcred
Jan 29 02:09:38 sebastien-B206 lightdm[15522]:
pam_kwallet5(lightdm-greeter:setcred): (null): pam_sm_setcred
Jan 29 02:09:38 sebastien-B206 lightdm[15522]:
pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
Jan 29 02:09:42 sebastien-B206 lightdm[15618]: pam_succeed_if(lightdm:auth):
requirement "user ingroup nopasswdlogin" not met by user "sebastien"
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/1782510
Title:
lightdm automatically logs in after logout
Status in GNOME Keyring:
New
Status in Light Display Manager:
New
Status in skype:
New
Status in lightdm package in Ubuntu:
Confirmed
Bug description:
Lightdm makes it impossible to logout. After I logout the lightdm logs
me automatically backs in.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lightdm 1.18.1-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-130.156-generic 4.4.134
Uname: Linux 4.4.0-130-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CurrentDesktop: KDE
Date: Thu Jul 19 01:18:52 2018
InstallationDate: Installed on 2016-04-26 (814 days ago)
InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64
(20160420.3)
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)
To manage notifications about this bug go to:
https://bugs.launchpad.net/gnome-keyring/+bug/1782510/+subscriptions
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