I've the same problem: debian testing (jessie) + lxde. Maximilian's solution:
>I found out that notifications work correct if I provide the following file >/usr/share/dbus-1/services/org.gnome.Notifications.service with content: > >[D-BUS Service] >Name=org.freedesktop.Notifications >Exec=/usr/lib/notification-daemon/notification-daemon works for me!
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