Good Morning, my friends!
@jonathon - No problem in network cuz when I’m running the Live, everything is ok, no problem. The problem starts only on installation.
@jruschme - Wired. As I said to our friend @jonathon, there’s no problem in connexion.
@ricklinux - Mirrors? I dont think so.
@anon92247698 - Right 
How could I install MX Linux and Linux Mint flawlessly if it was network problem?
I tried EndeavourOS, Archlinux, Artix, Cam-Arch Installer and all these ran the Live flawlessly and all of them, except Artix, failed on installation.
Artix does not fail to install, but it presents a pesky problem on installing packages and updating.
Linux based on Debian that I tried succeeded on installation and ran flawlessly. So no network problem, right?
Then I read @Kaan 's post: Can’t boot in to the system after kernel 5.12.1 and update and realized that his problems was similar to mine. And I remembered that Manjaro does not update the kernel like Archlinux and tried it et voilà. I’m running Manjaro with no problem.
Mates, I’m no computer or even Linux technician, but I think that the problem resides on the new packages (kernel, eos or whatever), I dont know. But it seems not to be my computer or my network.
Thank you very much.