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In the D-Bus "user bus" model, all sessions of a user share the same D-Bus instance, a polkit requesting process might live outside the login session which registered the user's polkit agent. In case a polkit requesting process is not part of the user's login session, we ask systemd-logind for the the user's "display" session instead. https://bugs.freedesktop.org/show_bug.cgi?id=78905
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