linux ssh login Permission denied (publickey)

possible reason:

1. The ssh service on Linux does not have a password to log in

   Two solutions have been found so far:

   • Open password login
     Execute sudo vim /etc/ssh/sshd_config, find PasswordAuthenticationan item, nochange it toyes

   • Add secret-free login
     In ~/.ssh/the directory, edit authorized_keysthe file and add the contents of the local public key file. (I am locally id_rsa.pub)

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Also, force ssh to provide rsa key:

ssh -o HostKeyAlgorithms=ssh-rsa [email protected]

See: https://qastack.cn/ubuntu/133172/how-can-i-force-ssh-to-give-an-rsa-key-instead-of-ecdsa