I fear the problem is beyond that.
nmcli is the same as doing it through mouse clicks, but from terminal. I tried it anyways, but it keeps "connecting" forever. The network manager icon keeps with the connecting animation doing rounds and nothing more. It is not related with the wifi dongle, since it happens with all of them. The strange thing is that everytime the system boots Ethernet interface is requesting a connection, even without cable plugged, and it lasts forever as well, till I manually disconnect it.
I smell that Uimage is causing the trouble, I feel it. I tried all Uimages from other versions of Orange-Pi without success.
Is there a chance of a new Lubuntu 15.10? maybe it will fix the problem, but I'm still unsure about it.
Thank you.