basic methods, starting with the easiest: (Tackle these one at a time...)
Package manager in GUI: find in your menus "install software" or something similar
Package manager in CLI: Same thing, but with a typed command---eg apt-get <package name>
Teh first 2 typically fetch the required files off of your install CD/DVD or off the internet
Download or otherwise acquire a package file, and install it with your package manager
Acquire an installation package in a *tar.gz format. Uncompress it and run a script to install it.
Acquire an installation package which--when uncompressed--contains source code. Compile this in your machine to create the application.
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