我写的文档复制过来没有图片，所以我会把写的文档上传，大家可以下载（下面的是我用qq截图截的）
因为我们学校有镜像网站，所以我修改了源，把我的/etc/apt/sources.list 更改了，大家也可以和我一样，因为是开放的，所以大家照写就行了，你们也可以在网上找一些镜像网站，只要能用就行。
第一步：找到/etc/apt/sources.list
打开
然后写入地址：
保存后
在终端打入：apt-get update 更新源
更新完成后就正式安装ssh service了 如不不想改，可以忽略前面所有步骤
在终端输入 apt-cache search ssh 查询你所需要的版本
如下图：
查到后输入：apt-get install openssh-server
进行安装
安装完成后查看ssh服务是否启动
有sshd说明已经启动服务
ssh server 安装完成：
查看ubuntu的ip
在windows下连接
先下载一个ssh 客户端
打开，输入ip和用户（root），如果连接错误，在文章的末尾，会出解决办法：
再输入用户密码，进去后可以看见
由于笔者事先配置好了，所以我就直接写修改哪里就行了
打开/etc/ssh/sshd-config
保存退出再次连接就行了 下面给出了所有信息
# Package generated configuration file
# See the sshd_config(5) manpage fordetails
# What ports, IPs and protocols we listenfor
Port 22
# Use these options to restrict which interfaces/protocolssshd will bind to
#ListenAddress ::
#ListenAddress 0.0.0.0
Protocol 2
# HostKeys for protocol version 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
HostKey /etc/ssh/ssh_host_ed25519_key
#Privilege Separation is turned on forsecurity
UsePrivilegeSeparation yes
# Lifetime and size of ephemeral version 1server key
KeyRegenerationInterval 3600
ServerKeyBits 1024
# Logging
SyslogFacility AUTH
LogLevel INFO
# Authentication:
LoginGraceTime 120
PermitRootLogin yes
StrictModes yes
RSAAuthentication yes
PubkeyAuthentication yes
#AuthorizedKeysFile %h/.ssh/authorized_keys
# Don't read the user's ~/.rhosts and~/.shosts files
IgnoreRhosts yes
# For this to work you will also need hostkeys in /etc/ssh_known_hosts
RhostsRSAAuthentication no
# similar for protocol version 2
HostbasedAuthentication no
# Uncomment if you don't trust~/.ssh/known_hosts for RhostsRSAAuthentication
#IgnoreUserKnownHosts yes
# To enable empty passwords, change to yes(NOT RECOMMENDED)
PermitEmptyPasswords no
# Change to yes to enablechallenge-response passwords (beware issues with
# some PAM modules and threads)
ChallengeResponseAuthentication no
# Change to no to disable tunnelled cleartext passwords
# Lifetime and size of ephemeral version 1server key
KeyRegenerationInterval 3600
ServerKeyBits 1024
# Logging
SyslogFacility AUTH
LogLevel INFO
# Authentication:
LoginGraceTime 120
PermitRootLogin yes
StrictModes yes
RSAAuthentication yes
PubkeyAuthentication yes
#AuthorizedKeysFile %h/.ssh/authorized_keys
# Don't read the user's ~/.rhosts and~/.shosts files
IgnoreRhosts yes
# For this to work you will also need hostkeys in /etc/ssh_known_hosts
RhostsRSAAuthentication no
# similar for protocol version 2
HostbasedAuthentication no
