Ubuntu ruby on rails

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http://www.unix.com – Hi, I am a php developer and I decided to learn ruby on rails. I have a few question. I have an ubuntu virtual machine with lamp. It mean that it has alrweady php and when I access the ip of the machine from my browser it does load the index.php. if I install ruby on rails will theere be collision between the php and ruby or the server just know that if I ask for ruby file or for php. second I find this guide to install ruby on ubuntu:Blog of Ryan Bigg - Ubuntu, Ruby, RVM, Rails, and You after I install ruby per the instruction in this manual, how can I know that I have done (HowTos)