It didn't work either. 
I can't return it. I'll have to use Windows (after a long time) while I get (hopefully) an antenna that works on Linux.
I think I'll have more luck getting an old Android smarthphone that can serve as an antenna 
Researching before I had seen that the antenna you recommend is one of the best performing with Linux; however, I can't buy it from Amazon at the moment.
Anyway I plan to install again my Linux distribution, since the one I have is the 18.04 and I would like the last one. I will install it and do this process again to see if it works; it doesn't hurt to try.
So nothing, I just have to thank you very much for taking the time to help me. I really appreciate it.
A hug.
P.S.: The positive side is that I learned to use the terminal a little more.