git中执行ssh -v [e-mail]一直是permission denied

[强圆nice]

执行结果是下面这样的，请问有什么错？已经执行过生成ssh key的命令了，试了几次都没有用，请问大神是神么错？我的系统是ubuntu16.04
OpenSSH_7.2p2 Ubuntu-4ubuntu1, OpenSSL 1.0.2g-fips 1 Mar 2016
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to github.com [192.30.253.113] port 22.
debug1: Connection established.
debug1: identity file /home/johnnyding/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /home/johnnyding/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/johnnyding/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/johnnyding/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/johnnyding/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/johnnyding/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/johnnyding/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/johnnyding/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu1
debug1: Remote protocol version 2.0, remote software version libssh-0.7.0
debug1: no match: libssh-0.7.0
debug1: Authenticating to github.com:22 as 'git'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: [e-mail]
debug1: kex: host key algorithm: ssh-rsa
debug1: kex: server->client cipher: [e-mail] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [e-mail] MAC: <implicit> compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ssh-rsa SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8
debug1: Host 'github.com' is known and matches the RSA host key.
debug1: Found key in /home/johnnyding/.ssh/known_hosts:1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/johnnyding/.ssh/id_rsa
debug1: Authentications that can continue: publickey
debug1: Trying private key: /home/johnnyding/.ssh/id_dsa
debug1: Trying private key: /home/johnnyding/.ssh/id_ecdsa
debug1: Trying private key: /home/johnnyding/.ssh/id_ed25519
debug1: No more authentication methods to try.
Permission denied (publickey).