Confirmed on the same image than the OP. It worked only once for me, then on another boot it prompted me for a PUK code, otherwise I get no prompt on boot and no unlock dialog when I tap on 'unlock' in the indicator.
Confirmed on the same image than the OP. It worked only once for me, then on another boot it prompted me for a PUK code, otherwise I get no prompt on boot and no unlock dialog when I tap on 'unlock' in the indicator.