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Following the process of booting my computer using the Install CD I burned with 64 bit Ubuntu 13.04, I manage to make it to the welcome screen of the installation wizard.

I follow the instructions given on the website up until I am told to choose the installation type. Instead of displaying any choice that would allow me to allocate drive space, all it displays is a blank table with a few buttons on the bottom and a bar filled with "/dev/sda" that's labeled, "Device for boot loader installation:"

If I try to click the install button, it brings up a dialogue box saying, No root file system is defined. Please correct this from the partitioning menu.
If I try to click anything else, it causes a internal error that ends up crashing Ubuntu and freezing my computer.
How do I fix this error and move on with installation as normal? I'd really love to start using Ubuntu, but this little obstacle is making that a little difficult. Any help I can get would be greatly appreciated. Thank you.

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