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This #Linux issue makes no sense. I copied an ssh key to my rasp pi 3, that went fine, logged in without needing a password. I disabled password login. Well, now it can't see ethernet.
No, I don't mean I can't connect to it and I've assumed it's offline. Sitting at a keyboard at the pi, it has self assigned 12.0.0.1 and no ping.
So I reverted the last thing I did. Rebooted. No change.
No fucking idea how disabling passwords for SSH made networking go away.