When trying to create a new session from the lock screen K -> Leave -> Lock -> New Session nothing happens and journalctl shows the errors like Feb 25 22:40:09 g55v kscreenlocker_greet[1511]: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/UserList.qml:24: TypeError: Cannot read property 'userName' of null Feb 25 22:40:09 g55v kscreenlocker_greet[1511]: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/lockscreen/LockScreen.qml:159: TypeError: Cannot read property 'showPassword' of undefined Feb 25 22:40:09 g55v kscreenlocker_greet[1511]: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/lockscreen/LockScreen.qml:184: TypeError: Cannot read property 'ButtonLabel' of undefined Feb 25 22:40:09 g55v kscreenlocker_greet[1511]: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/UserDelegate.qml:82:9: QML Image: Cannot open: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/user-identity Feb 25 22:40:09 g55v kscreenlocker_greet[1511]: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/UserDelegate.qml:82:9: QML Image: Cannot open: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/system-log-out Feb 25 22:40:09 g55v kscreenlocker_greet[1511]: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/UserList.qml:39:19: Unable to assign [undefined] to QString Feb 25 22:40:09 g55v kscreenlocker_greet[1511]: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/UserDelegate.qml:82:9: QML Image: Cannot open: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/system-switch-user Feb 25 22:40:09 g55v kscreenlocker_greet[1511]: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/UserList.qml:39:19: Unable to assign [undefined] to QString Feb 25 22:40:12 g55v kwin_x11[552]: QXcbConnection: XCB error: 3 (BadWindow), sequence: 14750, resource id: 62914576, major code: 18 (ChangeProperty), minor code: 0 Feb 25 22:46:52 g55v kwin_x11[552]: QXcbConnection: XCB error: 3 (BadWindow), sequence: 15067, resource id: 67108865, major code: 15 (QueryTree), minor code: 0 Feb 25 22:49:36 g55v kscreenlocker_greet[1581]: Calling KPluginInfo::property("X-KDE-PluginInfo-Name") is deprecated, use KPluginInfo::pluginName() in "/usr/lib/qt/plugins/plasma/packagestructure/plasma_packagestructure_plasmashell.so" instead. Feb 25 22:49:44 g55v kcminit[1594]: Qt: Session management error: networkIdsList argument is NULL Feb 25 22:49:44 g55v kcminit[1594]: QCoreApplication::postEvent: Unexpected null receiver
Same problem here: Okt 19 20:45:23 kwin_x11[730]: QXcbConnection: XCB error: 3 (BadWindow), sequence: 12846, resource id: 18874375, major code: 2 (ChangeWindowAttributes), minor code: 0 Okt 19 20:45:23 kdeinit5[688]: ktp-kded-module: Okt 19 20:45:23 kdeinit5[719]: Grab Released Okt 19 20:45:23 kwin_x11[730]: QXcbConnection: XCB error: 3 (BadWindow), sequence: 12801, resource id: 115343385, major code: 18 (ChangeProperty), minor code: 0 Okt 19 20:45:23 kdeinit5[719]: CreateNotify: 115343385 Okt 19 20:45:23 kdeinit5[719]: UnmapNotify: 115343373 Okt 19 20:45:23 kdeinit5[719]: UnmapNotify: 115343373 Okt 19 20:45:23 kdeinit5[719]: UnmapNotify: 115343371 Okt 19 20:45:23 kdeinit5[719]: UnmapNotify: 115343371 Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: (receiver name: 'DataSource') Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: (sender name: 'Local') Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: No such slot QObject::modelChanged(QString,QAbstractItemModel*) Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: (receiver name: 'DataSource') Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: No such slot QObject::dataUpdated(QString,Plasma::DataEngine::Data) Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: (receiver name: 'DataSource') Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: (sender name: 'AC Adapter') Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: No such slot QObject::modelChanged(QString,QAbstractItemModel*) Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: (receiver name: 'DataSource') Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: (sender name: 'AC Adapter') Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: No such slot QObject::dataUpdated(QString,Plasma::DataEngine::Data) Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: (receiver name: 'DataSource') Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: (sender name: 'Battery') Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: No such slot QObject::modelChanged(QString,QAbstractItemModel*) Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: (receiver name: 'DataSource') Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: (sender name: 'Battery') Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: No such slot QObject::dataUpdated(QString,Plasma::DataEngine::Data) Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: (receiver name: 'DataSource') Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: (sender name: 'Caps Lock') Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: No such slot QObject::modelChanged(QString,QAbstractItemModel*) Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: (receiver name: 'DataSource') Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: (sender name: 'Caps Lock') Okt 19 20:45:23 kscreenlocker_greet[3543]: QObject::disconnect: No such slot QObject::dataUpdated(QString,Plasma::DataEngine::Data) Okt 19 20:45:23 kcheckpass[3590]: pam_tally(kde:setcred): Error opening /var/log/faillog for update Okt 19 20:45:23 kcheckpass[3590]: pam_tally(kde:setcred): Error opening /var/log/faillog for update Okt 19 20:45:23 kcheckpass[3590]: pam_tally(kde:auth): Error opening /var/log/faillog for read Okt 19 20:45:23 kcheckpass[3590]: pam_tally(kde:auth): Error opening /var/log/faillog for update Okt 19 20:45:17 kdeinit5[719]: MapNotify: 18874375 Okt 19 20:45:17 kscreenlocker_greet[3543]: org.kde.keyboardLayout: Layouts list changed: ("de") Okt 19 20:45:17 kscreenlocker_greet[3543]: org.kde.keyboardLayout: Layouts list changed: ("de") Okt 19 20:45:17 kscreenlocker_greet[3543]: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/UserDelegate.qml:82:9: QML Image: Cannot open: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/system-swit Okt 19 20:45:17 kscreenlocker_greet[3543]: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/UserDelegate.qml:82:9: QML Image: Cannot open: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/system-log- Okt 19 20:45:17 kscreenlocker_greet[3543]: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/UserDelegate.qml:82:9: QML Image: Cannot open: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/user-identi Okt 19 20:45:17 kdeinit5[719]: CreateNotify: 115343379 Okt 19 20:45:16 kscreenlocker_greet[3543]: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/UserDelegate.qml:82:9: QML Image: Cannot open: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/system-swit Okt 19 20:45:16 kscreenlocker_greet[3543]: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/UserDelegate.qml:82:9: QML Image: Cannot open: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/system-log- Okt 19 20:45:16 kscreenlocker_greet[3543]: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/UserDelegate.qml:82:9: QML Image: Cannot open: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/user-identi Okt 19 20:45:16 kdeinit5[719]: CreateNotify: 115343376
the session handling code got reimplemented in 5.5 and I'm assuming it's fixed. In case you still experience the problem with 5.5 please reopen.
I am now using plasma desktop 5.5 and tried K -> Leave -> New Session Nothing happened. journalctl shows Dec 15 20:39:26 pe60 ksmserver[1149]: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/UserDelegate.qml:82:9: QML Image: Cannot open: file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/user-identity
@Munzir: thanks for testing @Kai: any ideas?
The output doesn't show anything unusual. Does it work when you start a new session from kickoff or the new user switcher plasmoid? However, they all use KDisplayManager which is pretty old, so most likely something in your setup that breaks it.
Created attachment 96132 [details] journalctl -b output Yes, it works when I test with the new user switcher plasmoid. I created a completely new user and tested again and nothing happen when I do it from K -> Leave -> New Session I am attaching the whole journalctl -b log in case you can figure out something.
This is now fixed.