ubuntu16.04　ssh 连不上问题解决。

今天在虚拟机配置ssh的时候，遇到ubuntu安装openssh-server 报依赖错误的问题，报错信息如下:

sudo apt-get install openssh-server
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 openssh-server : Depends: openssh-client (= 1:7.1p1-4)
                  Depends: openssh-sftp-server but it is not going to be installed
                  Recommends: ssh-import-id but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

解决

要安装对应版本的openssh-clien,来替换ubuntu自带的ｓｓh
然后再输入：

sudo apt-get install openssh-client=1:7.1p1-4
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libsnapd-glib1 snapd-login-service
Use 'sudo apt autoremove' to remove them.
Suggested packages:
  ssh-askpass libpam-ssh keychain monkeysphere
The following packages will be DOWNGRADED:
  openssh-client
0 upgraded, 0 newly installed, 1 downgraded, 0 to remove and 1 not upgraded.
Need to get 581 kB of archives.
After this operation, 37.9 kB disk space will be freed.
Do you want to continue? [Y/n] Y
Get:1 http://mirror.neu.edu.cn/ubuntu xenial/main amd64 openssh-client amd64 1:7.1p1-4 [581 kB]
Fetched 581 kB in 1s (521 kB/s)         
dpkg: warning: downgrading openssh-client from 1:7.2p2-4ubuntu2.1 to 1:7.1p1-4
(Reading database ... 172699 files and directories currently installed.)
Preparing to unpack .../openssh-client_1%3a7.1p1-4_amd64.deb ...
Unpacking openssh-client (1:7.1p1-4) over (1:7.2p2-4ubuntu2.1) ...
Processing triggers for man-db (2.7.5-1) ...
Setting up openssh-client (1:7.1p1-4) ...
Installing new version of config file /etc/ssh/ssh_config ...

再用
sudo apt-get install openssh-server

通过以下命令启动ssh服务

sudo service ssh start

sudo /etc/init.d/ssh start
如果没有出错就可以用ｓｓｈ的软件，输入虚拟机的 IP 地址进行链接。