Software is usually known as packages in Ubuntu. There are two ways to install packages in Ubuntu
1. The Hard way
2. The Easy way
The hard way is by using the terminal. You have to remember that the definition of hard depends on th user.
Go to Applications->Terminal. Type the name of the package you want. Suppose I want to install VLC media player.I type the name vlc in terminal. This is to check if the name I have typed is correct. If it is then the terminal will give the prompt
The program ‘vlc’ is currently not installed. You can install it by typing:
sudo apt-get install vlc-nox
Just folow the prompt and type the line and it will install the package for you after typing the root password.
The easy way is using the Synaptic package manager.
Go to System->Administration->Synaptic Package manager. It will prompt you for the passsword.
In the quick search bar type the name of the required package. Right click on the check box of the required package and select Mark for installation. Then finally click on Apply and you are done.