ubuntu - key_load_public: invalid format after ssh-keygen -


after updating ubuntu 16.04 i've problem ssh connection, connection require password though public key copied in remote authorized_keys ssh-copy-id. after new ssh-copy-id receive key_load_public: invalid format, sure of correct key format i've generated new key ssh-keygen , re-launch ssh-copy-id result same key_load_public: invalid format, same ssh connection in have type password. how can generate key , copy on remote server without receive invalid format error?

ssh -v <user>@<host-name> :

openssh_7.2p2 ubuntu-4ubuntu2.1, openssl 1.0.2g 1 mar 2016 debug1: reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: applying options * debug1: /etc/ssh/ssh_config line 57: deprecated option "useroaming" debug1: connecting <host-name> [<ip>] port 22. debug1: connection established. debug1: key_load_public: no such file or directory debug1: identity file /home/<user>/.ssh/id_rsa type -1 debug1: key_load_public: no such file or directory debug1: identity file /home/<user>/.ssh/id_rsa-cert type -1 debug1: key_load_public: no such file or directory debug1: identity file /home/<user>/.ssh/id_dsa type -1 debug1: key_load_public: no such file or directory debug1: identity file /home/<user>/.ssh/id_dsa-cert type -1 debug1: key_load_public: no such file or directory debug1: identity file /home/<user>/.ssh/id_ecdsa type -1 debug1: key_load_public: no such file or directory debug1: identity file /home/<user>/.ssh/id_ecdsa-cert type -1 debug1: key_load_public: no such file or directory debug1: identity file /home/<user>/.ssh/id_ed25519 type -1 debug1: key_load_public: no such file or directory debug1: identity file /home/<user>/.ssh/id_ed25519-cert type -1 debug1: enabling compatibility mode protocol 2.0 debug1: local version string ssh-2.0-openssh_7.2p2 ubuntu-4ubuntu2.1 debug1: remote protocol version 2.0, remote software version openssh_7.2p2 ubuntu-4ubuntu2.1 debug1: match: openssh_7.2p2 ubuntu-4ubuntu2.1 pat openssh* compat 0x04000000 debug1: authenticating <my_host>:22 '<user>' debug1: ssh2_msg_kexinit sent debug1: ssh2_msg_kexinit received debug1: kex: algorithm: curve25519-sha256@libssh.org debug1: kex: host key algorithm: ecdsa-sha2-nistp256 debug1: kex: server->client cipher: chacha20-poly1305@openssh.com mac: <implicit> compression: none debug1: kex: client->server cipher: chacha20-poly1305@openssh.com mac: <implicit> compression: none debug1: expecting ssh2_msg_kex_ecdh_reply debug1: server host key: ecdsa-sha2-nistp256 sha256:2xmttbzpu31c8ofzcyzmpsps9he0vaspa7rlikrx5aa authenticity of host '<host-name> (<ip>)' can't established. ecdsa key fingerprint sha256:2xmttbzpu31c8ofzcyzmpsps9he0vaspa7rlikrx5aa.

use ssh-keygen command generate key in remote machine then

cd ~/.ssh

generate sshkey in remote machine , copy .pub file authorized keys , execute following command that

cat <key>.pub >> authorized_keys

copy other key file(private key) machine , using can login. use following command that

ssh -i <key-file> <username>@<ip>

if want implement ssh connection without of key file every time add generated .pub file in machine ~/.ssh/authorized_keys of remote machine can login giving ip or hostname


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