Ubuntu includes some powerful tools for managing software. Here are some of those tools and terminology:
The basics
Installing Software
If you are just looking about how to install software, go hereSoftware Packaging Formats
Linux programs come packaged in a number of different ways. This is an overiew of themManaging Repositories in Ubuntu and Kubuntu
Increase the number of packages available to install on your system. What are repositories? Read: RepositoriesSynaptic
Synaptic (a graphical tool for apt-get) allows installation, upgrading and removing of programs.
These instructions assume that you have Administrative privileges on your computer. (If you installed Ubuntu yourself, you do.)
On the command line
Using apt-get
How to use apt-get package management systemUsing Aptitude
Using aptitude for package managementCommandline Package Management Tools
Survey of the various package management toolsCommandline Repository Management Tools
Managing Repositories from the command line