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dual boot ubuntu 12.04 on a computer already running windows 7...disk partition details

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http://askubuntu.com – i am a total beginner to the world of ubuntu. i would like you people to help me on how to dual boot ubuntu 12.04 on a computer already running windows 7 ultimate. okay, for specifications,i have dual core processor,2gb ram,500 gb hard disk with c occupying 100gb(windows is over here), d having 180 gb(all other stuff like movies, songs and stuff), e having 185gb(totally empty). i would like to install it on e by allocating 30gb (25 for root and 5 for swap)to it by partitioning the disk . the problem is that when i select"something else" option it shows all the disks properly but when i select (HowTos)