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I wanted to dual boot ubuntu and windows 8. I followed instruction found in Internet to create unallocated space from Disk Management in windows 8. But, I cannot see that space in my ubuntu installation window. Please look at the screenshot below:

enter image description here

Kindly suggest how can I manage to dual boot windows 8 and ubuntu in this case

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You've got a damaged partition table or leftover RAID data. This page of mine covers the issue in detail. Chances are you can fix it by running FixParts on the disk, but the details depend on the exact cause.

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