I have a machine that I installed the Windows 8 Developer Preview on. That replaced the OS that was already on there (Windows XP) so it was the only OS installed. I don't like Win8 so I decide to install Ubuntu on the machine. I used the Windows installer (wubi) on the Ubuntu website. Now, when I start up the machine it goes into the boot menu but it only gives me the option to pick Win8; Ubuntu doesn't show up as an option. I would really like to just get rid of the Windows 8 installation and just have Ubuntu installed. How can I do that?