how to create partitons while installing ubuntu 12.04

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http://askubuntu.com – i have windows 7 os.I want to install ubuntu 12.04 into my system in separate partition.I had made four partitions in windows for windows(100gb),for ubuntu(98.5gb),personal(500,logical).all are ntfs partions. i want ubuntu to be installed in partion ubuntu created by me.can anyone give a detailed procedure of how to do it.ubuntu and windows partion are primary,NTFS partitions.My ram is 8gb. (HowTos)