How to install Ubuntu 13.10 on MacBook Pro as Dual Boot?

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http://askubuntu.com – I want to install Ubuntu 13.10 in my MacBookPro. I am running Mountain Lion in my mac. I want to run both Mountain Lion and Ubuntu 13.10 in My mac. How to install ubuntu in my macbook without affecting existing data and OS with dual boot feature ? Thanks in advance. (HowTos)