For the wireless connection, yes, that's (apparently) the only solution, specially because the libre-kernel refuse to load privative drivers/firmware/stuff. But the main problem in my case was that the network card (by cable) stopped working. Now it has started to work again, after change the kernel to 4.8, but appart from some other issues, I still have no idea why it stopped to work in the first place.
Thanks a lot.

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