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With a WiFi home network, how to disable it permanently

Hi, all!

I installed Linux Mint 19.3 the other day, and enp9s0 keeps coming up when I type ifconfig. Even though in Network Settings I disabled it. I am able to shut it down in root with "ifconfig enp9s0 down" but that's only good until I boot up the next time.

Another strange thing, even when disabled in this way, "ethernet" shows up under my WiFi adapter! I'm like, why? I'm really baffled by this. (Again, a connection with an ethernet cable is impossible, so, no, I didn't once establish an ethernet con...
Hi, all!

I installed Linux Mint 19.3 the other day, and enp9s0 keeps coming up when I type ifconfig. Even though in Network Settings I disabled it. I am able to shut it down in root with "ifconfig enp9s0 down" but that's only good until I boot up the next time.

Another strange thing, even when disabled in this way, "ethernet" shows up under my WiFi adapter! I'm like, why? I'm really baffled by this. (Again, a connection with an ethernet cable is impossible, so, no, I didn't once establish an ethernet con...