Editing Grub boot menu order and changing default OS

I recently decided to try running a dual-boot system with Windows 7 and Ubuntu. I first installed Windows 7, and then installed Ubuntu. And with Ubuntu comes the GRUB boot loader, which pops up when I start the machine, and lets me choose which OS to use. If I don't choose anything, the item at the top of the list is selevted automatically after about 10 seconds.

I want to use Windows 7 by default, but unfortunatly Windows is at number 6 or 7 on the list. If I'm not paying attention when I start the machine, it boots into Ubuntu, and I have to restart it. How can I make Windows 7 the default OS?

The answer lies in reconfiguring the GRUB menu. There are several ways to do this, but I used the grub-customizer GUI app, which seems both very simple and flexible. Install it using the terminal:

sudo add-apt-repository ppa:danielrichter2007/grub-customizer
sudo apt-get update
sudo apt-get install grub-customizer

In the grub-customizer, you can reorder the GRUB menu items, and for example check the option "Default OS: Last used OS". You can read more about the grub-customizer on the How-To Geek Blog.