This is probably one of the easiest and safest ways to install Ubuntu on a PC running Windows. The Wubi installer let’s you install and remove Ubuntu just like any other software on Windows. There are two ways to use Wubi.
The first way is to download the Wubi installer and let it download Ubuntu for you during the installation. This method is good if you have a fast Internet connection. However I don’t recommend this method because while downloading if you experience any connection problems, you would have to start the installation process all over again.
The second way is to download the Ubuntu .iso image file and use the Wubi installer which comes with it. I’m going to explain this in a little detail here. Even though this method may sound a bit long, I think this is better than the first one.