I just upgraded my ubuntu to 16.04, and after a couple of days of working fine suddenly it stopped funtcioning. There is only one network available in the network list, and it's not mine.There are usally a lot of the as I live in a city. My mobile wifi neither has effect. The conection editor does not seem to give me any solution. Please help! Thank you.
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Please write the output of:
rfkill list
If your wlan0 is hard blocked, unblock it with fn+f2 button (or some other f button, which enables/disables wifi).

Alice
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lspci -knn | grep Net -A2
terminal command. – Pilot6 Aug 10 '16 at 13:52