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At the moment, endSessionDialog.js is assuming that PackageKit is available in some places, which often gets error messages in the journal for systems that do not ship PackageKit (e.g. Endless):

Polkit.Error: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Action org.freedesktop.packagekit.trigger-offline-update is not registered

I understand it's nice to use PackageKit to provide additional options to the user when ending the session while an update/upgrade is pending, but I also think it would be nice if the shell could add a run-time check to gracefully handle the situation when PackageKit is not available.