Microphone isn't working at all on Ubuntu 16.04.02TLS

I have tried various "solutions" from different websites. I tried playing with the channels in pavucontrol, and looking at the alsamixer, but nothing. Here you can find a link with the images of my pavucontrol and alsamixer: https://imgur.com/a/wkZsJ

Also, here is a more detailed post about my problem: https://unix.stackexchange.com/questions/367459/microphone-not-working-on-ubuntu-16-04-02tls-gnome

And here you can find a link with all the diagnostics: http://www.alsa-project.org/db/?f=4a54db64617b19e8f23173336ddec710b07b8467