-1) start the deamon in background as root: avahi -D
-2) start the Gui to browse zeroconf network as your user: avahi-discover
+1) start the deamon in background as root: avahi-daemon -D
+Or (You shouldn't start avahi-daemon and avahi-discover at the same time.)
+1) start the Gui to browse zeroconf network as your user: avahi-discover