your ruby is:

> ruby -v
> ruby 2.1.5p273 (2014-11-13 revision 48405) [x86_64-linux]

but rails new prints:

> 
/usr/local/rvm/gems/ruby-2.1.2@global/gems/bundler-1.7.7/lib/bundler.rb:301: 
warning: Insecure world writable dir /usr/local/rvm/gems in PATH, mode 
042777

which means you are not using RVM ruby properly, in "prueba2" directory 
please run:

    rvm use ruby-2.1.2 &&
    bundle install

if there are any instructions printed on the way make sure to follow them 
and try repeating till it works

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