Tutorial on Synaptic Manager Edit
There are three main package managers (i.e one which is used to install,upgrade or remove software packages) in ubuntu.
Add/Remove Applications:This is present in Applications tab of top desktop panel.This is easiest way to install but is not recomended due its limited scope and hence we will not mention any more of this here. Synaptic Package Manager:This is the most prefered way and we will talk about this in detail in this tutorial. Apt:This is powerful package manager if you prefer to use terminal.
Synaptic package manger
Synaptic is a computer program which is a GTK+ graphical user interface front-end to the Advanced Packaging Tool for the Debian package management system.It can be used to install, remove and upgrade software packages and to add repositories. (A repository is a storage location from which software packages may be retrieved and installed on a computer.)
The synaptic manager can be found in System-->Administration-->Synaptic Package Manager. When you click on it you will be prompted for a password which is your sudoer's password(root password or usually login password if you are the sole user).Once password is given you will see a screen similar to one below.