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Installing software on Linux is very easy using the apt-get command. Using sudo apt-get install apache2 your server will download Apache2, and install it without you needing media.
Note: Debian distributions of Linux use apt-get to install software. Red Hat distress use yum.
http://manpages.ubuntu.com/manpages/xenial/man8/apt-get.8.html
To Install Software
sudo apt-get update – Updates repository information
sudo apt-get install PACKAGENAME – Downloads and installs software
Upgrade/ Update Software
sudo apt-get upgrade
Uninstall Software
sudo apt-get remove PACKAGENAME – Unistalls software but leaves configuration files.
sudo apt-get purge PACKAGENAME – Uninstalls software and deletes configuration files.