Ubuntu Installation (Dual Boot)

First I've install Windows 7 in my laptop and now I want to add Ubuntu 13.10 (Saucy Salamander).
And this is my first time to install dual boot ubuntu.

This is the step of installation:

1. From windows 7 you need to prepare (and format) the primary partition for ubuntu partition (I using EaseUS Partition. You can download it from here). Ubuntu using ext2 format. Note: ubuntu only allow 4 primary partition so change all your data partition as logical partition
2. After that you can install your ubuntu via DVD or flashdisk (I using DVD). You can read the installation step here. For step 4 using try something else and choose your partition that you have prepared in number 1.
3. And now you have Windows and ubuntu in your computer.