I haven't tested this, but since seb128 pasted the relevant messages in IRC.
I bet you that it's because polkit isn't considering the D-Bus session of the greeter to be 'active', because it's not finding it. If someone would like to test build a systemd with this commit included: https://github.com/systemd/systemd/commit/a2dcb1d78737d3daa301ee63fbdd02837acb71a8 I suspect the problem would be fixed. ** Also affects: systemd (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1847896 Title: Unable to shutdown or restart from log-in screen Status in gnome-shell package in Ubuntu: Confirmed Status in systemd package in Ubuntu: New Bug description: When selecting the shutdown icon from the log-in screen you are prompted with a dialog that allows you to either cancel, restart or shutdown. It has been noted that the restart and shutdown options no longer work. ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: gnome-shell 3.34.1-1ubuntu1 ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1 Uname: Linux 5.3.0-18-generic x86_64 ApportVersion: 2.20.11-0ubuntu8 Architecture: amd64 CurrentDesktop: GNOME Date: Sun Oct 13 09:08:23 2019 DisplayManager: gdm3 InstallationDate: Installed on 2019-05-17 (148 days ago) InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Alpha amd64 (20190517) RelatedPackageVersions: mutter-common 3.34.1-1ubuntu1 SourcePackage: gnome-shell UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1847896/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
