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I have a desktop computer running the latest version of Ubuntu 12.04. But it keeps freezing after 2-3 minutes. How can I erase the disk and reinstall? (I already saved all I needed information that I like to keep). Can I boot from a USB key? I have access to another computer for download.

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Do you believe some action or steps you chose may have led to the current Ubuntu install becoming unstable? Did it fail to properly install, or give an error message? Otherwise what is causing this may be unstable hardware, and/or a software compatibility issue. –  david6 Jun 12 '12 at 7:32

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You can boot either from the USB that you mentioned, or from CD. To install from CD, just Download Ubuntu, burn it into a CD. Boot from CD ( make sure you system is set to boot from CD), and follow the installation steps. When you get to the Allocate Drive Space 0r (installation Type),

enter image description here Choose Erase Disk and Install. To use USB, you can See this site

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