Ruby on Rails

hi group im new to rails i follow instruction about instalation rails in ubuntu12.04 in this url https://www.digitalocean.com/community/articles/how-to-install-ruby-on-rails-on-ubuntu-12-04-lts-precise-pangolin-with-rvm  everything was just fine but when i logout or restart the pc rails is lost if i try rails new app or something else i get this answer on the terminal sudo apt-get install rails

the problem is already posted in stackoverflow in this url http://stackoverflow.com/questions/4976861/rvm-settings-lost-after-every-logout but not satisfactory answer

thanks i hope you can help me!

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