How To Install openssh-server on Ubuntu 18.04
Introduction
In this tutorial we learn how to install openssh-server on Ubuntu 18.04.
What is openssh-server
openssh-server is:
This is the portable version of OpenSSH, a free implementation of the Secure Shell protocol as specified by the IETF secsh working group.
Ssh (Secure Shell) is a program for logging into a remote machine and for executing commands on a remote machine. It provides secure encrypted communications between two untrusted hosts over an insecure network. X11 connections and arbitrary TCP/IP ports can also be forwarded over the secure channel. It can be used to provide applications with a secure communication channel.
This package provides the sshd server.
In some countries it may be illegal to use any encryption at all without a special permit.
sshd replaces the insecure rshd program, which is obsolete for most purposes.
There are three methods to install openssh-server on Ubuntu 18.04. We can use apt-get, apt and aptitude. In the following sections we will describe each method. You can choose one of them.
Install openssh-server Using apt-get
Update apt database with apt-get using the following command.
sudo apt-get update
After updating apt database, We can install openssh-server using apt-get by running the following command:
sudo apt-get -y install openssh-server
Install openssh-server Using apt
Update apt database with apt using the following command.
sudo apt update
After updating apt database, We can install openssh-server using apt by running the following command:
sudo apt -y install openssh-server
Install openssh-server Using aptitude
If you want to follow this method, you might need to install aptitude first since aptitude is usually not installed by default on Ubuntu. Update apt database with aptitude using the following command.
sudo aptitude update
After updating apt database, We can install openssh-server using aptitude by running the following command:
sudo aptitude -y install openssh-server
How To Uninstall openssh-server on Ubuntu 18.04
To uninstall only the openssh-server package we can use the following command:
sudo apt-get remove openssh-server
Uninstall openssh-server And Its Dependencies
To uninstall openssh-server and its dependencies that are no longer needed by Ubuntu 18.04, we can use the command below:
sudo apt-get -y autoremove openssh-server
Remove openssh-server Configurations and Data
To remove openssh-server configuration and data from Ubuntu 18.04 we can use the following command:
sudo apt-get -y purge openssh-server
Remove openssh-server configuration, data, and all of its dependencies
We can use the following command to remove openssh-server configurations, data and all of its dependencies, we can use the following command:
sudo apt-get -y autoremove --purge openssh-server
References
Summary
In this tutorial we learn how to install openssh-server package on Ubuntu 18.04 using different package management tools: apt, apt-get and aptitude.
