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I booted Ubuntu using an external hard drive. Is it possible to install it on the same hard-drive without unplugging or turning it off? I only have one working USB port and the internal PC hard-drive is dead.

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You can only do so if you are installing it to a partition other than that you are booting it from, even on the same disk. – hexafraction Sep 21 '12 at 20:33

You need to partion your hardrive first. Then install the live environment on one half. When you boot into the installer you can now install on the other half.

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First, you can use GParted to partition your harddisk(you can shrink your partition without losing your data and then make another partition).

When you have 2 partition then you can install Ubuntu on the other partition even when you are booting from the first.

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