两台主机上的 Ubuntu 18.04x64
ssh-keygen -t rsa
ssh-copy-id -i ~/.ssh/id_rsa.pub user@192.168.0.10
ssh -vvv user@192.168.0.10
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey debug1: Next authentication method: publickey debug1: Offering public key: RSA SHA256:0TxSX/JrA4MPDwj/iac86aOwmZbir+e6sGBp6CdiZK8 /home/alexandr/.ssh/id_rsa
debug3: send_pubkey_test
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51
user@user-desktop:~$ sudo nano /etc/ssh/sshd_config
UseDNS no
PermitRootLogin yes
SyslogFacility AUTH
LogLevel INFO
AddressFamily any
Protocol 1, 2
PubkeyAuthentication yes
RSAAuthentication yes
AuthorizedKeysFile .ssh/authorized_keys .ssh/authorized_keys2 /etc/ssh/user/authorized_keys
ChallengeResponseAuthentication no
UsePAM yes
X11Forwarding yes
PrintMotd no
AcceptEnv LANG LC_*
Subsystem sftp /usr/lib/openssh/sftp-server
ls -alh ~/.ssh
итого 24K
drwx------ 2 user user 4,0K мая 3 15:35 .
drwxrwxrwx 28 user user 4,0K мая 3 16:24 ..
-rw------- 1 user user 2,5K мая 3 15:47 authorized_keys
-rw------- 1 user user 771 мая 3 14:54 id_dsa
-rw-r--r-- 1 user user 607 мая 3 14:54 id_dsa.pub
-rw-r--r-- 1 user user 444 мая 3 14:56 known_hosts
在服务器上：
journalctl -f
Authentication refused: bad ownership or modes for directory /home/user/.ssh
须藤 chmod 700 ~/.ssh
解决方案在这里找到。