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I am trying to install ubuntu 12.04. And i have windows 7 already installed. But while installing through CD-ROM i'm getting this error:

Unable to find medium for connecting live file system
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Check the CD, Drive, or controller. – Mitch May 3 '13 at 17:22

Is you CD-ROM connected trough a USB by any chance? If it is make sure it is not connected to a USB 3

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