Installation of the OpenSSH client and server applications is simple. If you want to install  OpenSSH server application, and related support files it the Correct way, Open Up a Terminal Using Ctrl+Alt+T and Type the below commands,



 $ sudo apt install openssh-client



 $ sudo apt install openssh-server


Check your OpenSSH currently installed version, 

 $ sudo sshd -V



unknown option -- V

OpenSSH_6.7p1 Ubuntu-5ubuntu1.3, OpenSSL 1.0.1f 6 Jan 2014

usage: sshd [-46DdeiqTt] [-b bits] [-C connection_spec] [-c host_cert_file]

            [-E log_file] [-f config_file] [-g login_grace_time]

            [-h host_key_file] [-k key_gen_time] [-o option] [-p port]

            [-u len]


If it's up to date then nothing will be done, and Then to Install the latest

Download latest version using wget command and runs the following commands, ./configure, make and make install 

 $ sudo wget http://mirror.exonetric.net/pub/OpenBSD/OpenSSH/portable/openssh-7.4p1.tar.gz



 $ sudo tar -zxvf openssh-7.4p1.tar.gz 



 $ sudo cd openssh-7.4p1 



 $ sudo ./configure 

 


You may get some following output,
 
OpenSSH has been configured with the following options:
                     User binaries: /usr/local/bin
                   System binaries: /usr/local/sbin
               Configuration files: /usr/local/etc
                   Askpass program: /usr/local/libexec/ssh-askpass
                      Manual pages: /usr/local/share/man/manX
                          PID file: /var/run
  Privilege separation chroot path: /var/empty
            sshd default user PATH: /usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin
                    Manpage format: doc
                       PAM support: no
                   OSF SIA support: no
                 KerberosV support: no
                   SELinux support: no
                 Smartcard support: 
                     S/KEY support: no
              MD5 password support: no
                   libedit support: no
  Solaris process contract support: no
           Solaris project support: no
         Solaris privilege support: no
       IP address in $DISPLAY hack: no
           Translate v4 in v6 hack: yes
                  BSD Auth support: no
              Random number source: OpenSSL internal ONLY
             Privsep sandbox style: seccomp_filter

 

$ sudo make 



$ sudo make install 

 

Run sshd -V or ssh -V and they'll return the version and usage information.

 $ sudo sshd -V



unknown option -- V

OpenSSH_7.4p1, OpenSSL 1.0.1f 6 Jan 2014

usage: sshd [-46DdeiqTt] [-C connection_spec] [-c host_cert_file]

            [-E log_file] [-f config_file] [-g login_grace_time]

            [-h host_key_file] [-o option] [-p port] [-u len]



 


(or)

 $ sudo apt-cache policy openssl