Ubuntu 16.04 LTS中没有.ssh文件，该如何解决呢？

chen@ubuntu:~$ sudo apt install openssh-server
[sudo] chen 的密码： 
正在读取软件包列表... 完成
正在分析软件包的依赖关系树       
正在读取状态信息... 完成       
openssh-server 已经是最新版 (1:7.2p2-4ubuntu2.4)。
升级了 0 个软件包，新安装了 0 个软件包，要卸载 0 个软件包，有 2 个软件包未被升级。
chen@ubuntu:~$ sudo /etc/init.d/ssh restart 
[ ok ] Restarting ssh (via systemctl): ssh.service.
chen@ubuntu:~$ ps -e | grep ssh
  1884 ?        00:00:00 ssh-agent
  5936 ?        00:00:00 sshd
chen@ubuntu:~$ ssh-keygen 
Generating public/private rsa key pair.
Enter file in which to save the key (/home/chen/.ssh/id_rsa): 
Created directory '/home/chen/.ssh'.
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/chen/.ssh/id_rsa.
Your public key has been saved in /home/chen/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:oynEdTWEUxfMmG1/c1tBFW7krVgdP+LZ2XtcRaPcgQQ chen@ubuntu
The key's randomart image is:
+---[RSA 2048]----+
|         +=E=ooB=|
|        o.oo*.*+*|
|      . .. . =.**|
|   . . .    .o*oO|
|    o   S   .o.+B|
|   .   o .     oo|
|    . o        .o|
|     .          .|
|                 |
+----[SHA256]-----+
chen@ubuntu:~$