[ubuntu] Triple Boot Win7-Win7-Ubuntu

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http://ubuntuforums.org – Hi to everyone, i'm here because i need a little support to install ubuntu on my laptop. Actually i have two installation or Windows7: - one for everyday use (internet, music/video, web design) - one for music production (it's an optimized version of Win7) To delete all problem to the second installation, i've install the two copy on hidden partitions. So my everyday copy don't see my music copy. To do so, i use MasterBooter to select what windows version boot up from the hidden partitions. Now i want to insert a copy of ubuntu 12.04 and make a triple boot. How i can do it? Can anyone he (Hardware)