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This might seem a really stupid question. I have windows 8 on my laptop. I am trying to install Ubuntu 12.04 alongside it. My hard drive is supposed to have 20 GB unallocated space on it to install Ubuntu. Now I am in the installation phase. And I can't seem to find it.

There is a window which says installation type. There are options like /dev/sda1, /dev/sda2, /dev/sda3 etc. But I can't seem to understand which one to select.

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"Unallocated space" isn't a partition; it's the unused space between partitions. It won't have a device name until you create one or more partitions in that space.

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