Dual booting Ubuntu on Windows 7 from E:// drive

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http://askubuntu.com – I am planning on installing Ubuntu 12 on top of Windows 7 as a dual-bootable system. I have completely emptied the E:// drive, equaling to almost 80 GB of free space. I want to install Ubuntu on this drive (thus leaving only the C:// and F:// drives for Windows). With reference to this article, can anyone tell me which stage would let me choose the E:// drive as the space where I want to install Ubuntu? (HowTos)