1. adduser

root@ubuntu:~# adduser lwk
perl: warning: Setting locale Failed.
perl: warning: Please check that your locale settings:
	LANGUAGE = (unset),LC_ALL = (unset),LC_PAPER = "zh_CN.UTF-8",LC_ADDRESS = "zh_CN.UTF-8",LC_MONETARY = "zh_CN.UTF-8",LC_NUMERIC = "zh_CN.UTF-8",LC_TELEPHONE = "zh_CN.UTF-8",LC_IDENTIFICATION = "zh_CN.UTF-8",LC_MEASUREMENT = "zh_CN.UTF-8",LC_NAME = "zh_CN.UTF-8",LANG = "en_US.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to a fallback locale ("en_US.UTF-8").
Adding user `lwk' ...
Adding new group `lwk' (1001) ...
Adding new user `lwk' (1001) with group `lwk' ...
Creating home directory `/home/lwk' ...
Copying files from `/etc/skel' ...
Enter new UNIX password: 
Retype new UNIX password: 
passwd: password updated successfully
Changing the user information for lwk
Enter the new value,or press ENTER for the default
	Full Name []: lwk
	Room Number []: 
	Work Phone []: 
	Home Phone []: 
	Other []: 
Is the information correct? [Y/n] 
root@ubuntu:~#

2.sudo权限

usermod -a -G sudo lwk

3.install openssh-server

root@ubuntu:~# apt install openssh-server

4.添加本地公钥到远程服务器上去

lwk@qwfys ~ $ ssh-copy-id -i ~/.ssh/id_rsa.pub lwk@192.168.1.25

如果些前已经用当前密钥登录过远程服务器，需要用下面命令从本地删除老的远程服务器列表

lwk@qwfys ~ $ ssh-keygen -f "/home/lwk/.ssh/known_hosts" -R 192.168.1.25

5. ssh登录

lwk@qwfys ~ $ ssh lwk@192.168.1.25
Welcome to Ubuntu 16.04.3 LTS (GNU/Linux 4.4.0-87-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

75 packages can be updated.
32 updates are security updates.


Last login: Fri Nov 10 14:53:04 2017 from 192.168.1.4
lwk@ubuntu:~$