I do not know if this error message is related to your issue. Please attach the full log file(s) to make sure that we do not miss anything relevant.
Regardless of that, I would suggest to test with another greeter: - install unity-greeter (sudo apt install --no-install-recommends unity-greeter) - move or rename the file /usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-greeter.conf - reboot or restart lightdm Furthermore, you could boot into the live session of the Xubuntu 18.10 development release, and check if the problem is still present. Note that light-locker needs to be manually started. -- You received this bug notification because you are a member of LightDM Gtk+ Greeter Development Team, which is subscribed to lightdm-gtk- greeter in Ubuntu. https://bugs.launchpad.net/bugs/1796374 Title: locking session turns off external monitor Status in light-locker package in Ubuntu: New Status in lightdm-gtk-greeter package in Ubuntu: New Bug description: When session is locked display switches from external monitor to laptop screen. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: light-locker 1.8.0-1ubuntu1 ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18 Uname: Linux 4.15.0-34-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.9-0ubuntu7.4 Architecture: amd64 CurrentDesktop: XFCE Date: Fri Oct 5 19:58:24 2018 InstallationDate: Installed on 2018-03-22 (196 days ago) InstallationMedia: Xubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228) SourcePackage: light-locker UpgradeStatus: Upgraded to bionic on 2018-09-05 (30 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/light-locker/+bug/1796374/+subscriptions -- Mailing list: https://launchpad.net/~lightdm-gtk-greeter-team Post to : [email protected] Unsubscribe : https://launchpad.net/~lightdm-gtk-greeter-team More help : https://help.launchpad.net/ListHelp
