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My computer currently runs on Win XP, and I would like to install Ubuntu 12.04. I downloaded the ISO file, booted a USB, and restarted my netbook. I selected the option to install Ubuntu along Windows XP, but it shows up a window that requires the partition division.

What must I do to run Ubuntu along Windows XP?

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Manually changing the partitions as part of the installation process is relatively straightforward. See Manual partitioning for an example and a number of helpful links including some to video tutorials.

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Anyway, it says "No root file system is defined. Please correct this from the partitioning menu"...what should I do?! – Steve Oct 15 '12 at 17:12

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