Ubuntu 18.04 开启 root ssh 登录

修改 root 密码

$ sudo passwd root
[sudo] password for linuxconfig:
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully

允许 root 登录

$ sudo sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config

重启 ssh 服务

$ sudo service ssh restart