Problem with SSH connection.
Problem with SSH connection.
You’ve set up SSH on your Debian SBC, and it connects fine. On the Lubuntu machine you’re running OpenSSH, the first client works perfectly. When you try connecting another device, an authentication prompt appears—meaning the password is required now. Check if your SSH configuration allows password-only login or adjust it accordingly.
The error means the server certificate has been updated since your last connection, likely after reinstalling.
known_hosts is a text file. If you can't locate /home/<user>/.ssh, it means you're not authenticated as that user with the ssh client (or it's set up differently).
Running ssh-keygen with a specific server IP resolved the problem on the client side