(In reply to Fabian Vogt from comment #6) > (In reply to Andreas from comment #5) > > (In reply to Fabian Vogt from comment #4) > > > Display :99 sounds strange. Which display manager do you use? If it's > > > lightdm, try sddm or gdm. > > I'm using the default SDDM for KDE Plasma installation. > > So the question is where DISPLAY=:99 is coming from. IIRC that's what > Flatpak sets inside the sandbox for X11 mediation. I have no idea what might > send that into the dbus activation environment. > I have the suspicion that flatpak breaks this somehow. Can you try the > following (I don't have access to 15.4 myself currently): I tried to reproduce this on a Gnome Live CD and there is no such problem. > 1. qdbus-qt5 org.freedesktop.impl.portal.desktop.kde (to start the process > without using flatpak) I start it with sudo and "Could not connect to D-Bus server: org.freedesktop.DBus.Error.NotSupported: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11" > And this: > 1. Reproduce the issue > 2. Run "qdbus-qt5 org.freedesktop.impl.portal.desktop.kde" (it should fail) > 3. Run dbus-update-activation-environment --all > 4. Try 2 again (it should succeed) > 5. Try to trigger the issue again sudo dbus-update-activation-environment --all "dbus-update-activation-environment: error: unable to connect to D-Bus: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11"