How install ruby-rvm on ubuntu 11.04?

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http://unix.stackexchange.com – I want to install rails environment on ubuntu 11.04. I type: sudo apt-get install ruby-rvm => Unable to locate package ruby-rvm what i made in Ubuntu 11.10 to make the same task (But my current pc is ubuntu 11.04): sudo apt-get install ruby-rvm rvm install ruby-1.9.3-p125 sudo gem update --system sudo gem install rails (HowTos)