When you install Ubuntu (or any other Linux OS), it makes Ubuntu the default operating system. So if you want to use Windows, you have to select it manually within 10 sec otherwise it boots into Ubuntu directly. How to Make Windows default OS in dual boot with Ubuntu?
But what if you are not a regular Ubuntu user (Why so?) and use Windows most of the time? It irritates you that you have to wait at each boot to select Windows. If you are facing such problems then you might want to make Windows your default operating system so that it boots into Windows by default.
One way to change the boot order is by changing the Grub configuration files. But the beginner Ubuntu users might not be at ease with the idea of changing the config file. The easiest (suggested for beginners) method is to use Start-up Manager Tool. It is a GUI tool which lets you select your default OS and the default timeout.
To install the Start-up manager type this command in the terminal (Ctrl+Alt+T: shortcut in Ubuntu for opening the terminal):
sudo apt-get install startupmanager
After installing the startup manager, run it (Press Windows Key and then search for it in Ubuntu 11.04 and 11.10). The GUI tool gives you the option of choosing the OS and the timeout, something like this:
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