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When I get to the part where you partition your disk, no disks are shown. How do I fix this? Do I need to shrink one of my partitions so I have some free (unallocated) space?

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up vote 2 down vote accepted

unmount all partitions before running the partitioner

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How do I do that? – The Green Frog Sep 2 '09 at 8:10
the partitions should appear on the desktop,right click on them,then choose "unmount",do this to all the drives you see on the desktop,then start the partitioner – Mahmoud Hossam Sep 2 '09 at 8:27

Try to install Ubuntu using the alternate install CD,

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