How to uninstall Windows and install Ubuntu instead? [duplicate]

How to uninstall Windows and install Ubuntu instead? [duplicate]

This question already has an answer here:
How to replace Windows with Ubuntu? 5 answers
I want to uninstall Windows and install Ubuntu on my laptop. For now I
have Windows 7 Professional and the version of Ubuntu that I want is
Ubuntu 13.04. My question is:
What should I do to uninstall Windows 7 and install Ubuntu 13.04 on my
laptop?
Thanks.