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I have both Ubuntu and Windows 7 on my computer. I want to fresh install Ubuntu 12.04. I want to remove older Ubuntu and install Ubuntu 12.04 without any changes on Windows 7. I know I can upgrade and all. But I decided I want fresh install.

How can I do that?

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Back up your data from both operating systems.
Make a live USB or CD of the desired version the same way you did before.
Boot from it.
Then choose to install and during the procedure select install alongside and, when prompted, allow the installation procedure to overwrite the current Ubuntu installation. At your discretion, you may choose to retain the /home folder or wipe that as well. That's all.

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thanks's mate. If I had enough reputation, I would have voted up your question. – meandbobbymcgee Feb 15 '13 at 12:43
Boot from live usb. Install Gparted. Delete the drives contains ubuntu os. Start installation. Choose custom layout. Create new partitions from the free space. Install it. Create two partitions /boot and swap. Install. – Curious Apprentice Feb 15 '13 at 12:48

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