the psycho cat on an HP Mini with Ubuntu
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Installing a dual-boot with Windows without partitioning
Introduction to Wubi
The nice thing about this approach from a Windows-user standpoint is that there is no risk of accidentally deleting your entire drive, you don't have to know anything about partitions, and you can easily remove Ubuntu from the dual-boot if you want to go back to a strictly Windows-only system.
Apparently this is now called Windows installer. No biggie. It still functions the same way.
Go to the Wubi website and download the Wubi installer.
At this point (before you click Install), you have two options. You can let Wubi download the Ubuntu disk image file for you, or you can make sure your own Ubuntu .iso is in the same directory as the Wubi installer.
It was so quick I couldn't take a screenshot, but you may see some text appear briefly on a black screen right after you reboot and get past the BIOS screen. That's fine. Just wait for it.
Wubi sets up the dual-boot so that the default boot choice is Windows. If you want to change the default to be Ubuntu instead, go to the Control Panel in Windows.
If you don't like Ubuntu, you can uninstall it just like any other Windows program by going to Programs and Features in the Control Panel and select Uninstall/Change for Ubuntu.
Believe me—this is a lot easier than trying to remove Ubuntu from a traditional dual-boot (one that involves repartitioning the drive and reinstalling the Windows boot loader). I've seen far too many Ubuntu Forums threads or Yahoo Answers questions about how to remove Ubuntu for me to recommend a traditional dual-boot as the standard dual-boot for new users.
Last updated 10/20/12 07:47
I will not give help to people posting in the above places. If you require technical support, start a support thread on the Ubuntu Forums. That is the appropriate place to ask for help.