TP-Link TL-WN725N V2 won't connect to my network

[Esteban Knöbl]

I bought a TP-Link wireless nano USB adapter (TL-WN725N V2) to replace a
malfunctioning PCI wireless card on my desktop computer. When I plug the
USB adapter, the system recognizes all available networks, but it won't
connect. It asks me for my password, start connecting... and then my
password again, as if I'd put a wrong one. But I'm sure the password is ok.

The PCI card has been removed.

I use Lubuntu 16.04.02, and have a dual boot with Windows 7. In windows the
adapter works fine
​.

Any clues?

--
Esteban​
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