I' trying to make my first steps with Ruby on Rails. I'm working on a Ubuntu 14.04. As suggested by a website, I've installed rvm to manage my Ruby installations and gem sets. The commands I've used are

rvm install ruby-1.9.2-p320 rvm use --default 1.9.2-p320 gem install rails -v 3.0 

At the moment, this is the situation with the installation

<01/nov 15:25> [Ruby_On_Rails]$ rvm list rvm rubies =* ruby-1.9.2-p320 [ x86_64 ] ruby-1.9.3-p547 [ x86_64 ] ruby-2.1.2 [ x86_64 ] ruby-head [ x86_64 ] # => - current # =* - current && default # * - default 

and here is the gemset list

<01/nov 15:28> [Ruby_On_Rails]$ rvm gemset list gemsets for ruby-1.9.2-p320 (found in /home/lorenzo/.rvm/gems/ruby-1.9.2-p320) => (default) global 

finally, here is the gem list

<01/nov 15:30> [Ruby_On_Rails]$ gem list *** LOCAL GEMS *** abstract (1.0.0) actionmailer (3.0.0) actionpack (3.0.0) activemodel (3.0.0) activerecord (3.0.0) activeresource (3.0.0) activesupport (3.0.0) arel (1.0.1) builder (2.1.2) bundler (1.7.4, 1.0.22) bundler-unload (1.0.2) erubis (2.6.6) executable-hooks (1.3.2) gem-wrappers (1.2.7) i18n (0.7.0.beta1, 0.4.2) json (1.8.1) mail (2.2.20) mime-types (1.25.1) minitest (5.4.2, 1.6.0) polyglot (0.3.5) rack (1.2.8) rack-mount (0.6.14) rack-test (0.5.7) rails (3.0.0) railties (3.0.0) rake (0.8.7) rdoc (2.5.8) rubygems-bundler (1.4.4) rvm (1.11.3.9) thor (0.14.6) thread_safe (0.3.4) treetop (1.4.15) tzinfo (1.2.2, 0.3.42) 

When I try to launch rails new, it gives me an error becuse one of the ruby gems is in conflict with rails 3.0

<01/nov 15:22> [Ruby_On_Rails]$ rails --version /home/lorenzo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/site_ruby/1.9.1/rubygems/specification.rb:2064:in `raise_if_conflicts': Unable to activate rails-3.0.0, because bundler-1.7.4 conflicts with bundler (~> 1.0.0) (Gem::LoadError) from /home/lorenzo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/site_ruby/1.9.1/rubygems/specification.rb:1262:in `activate' from /home/lorenzo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_gem.rb:54:in `gem' from /home/lorenzo/.rvm/gems/ruby-1.9.2-p320/bin/rails:22:in `<main>' from /home/lorenzo/.rvm/gems/ruby-1.9.2-p320/bin/ruby_executable_hooks:15:in `eval' from /home/lorenzo/.rvm/gems/ruby-1.9.2-p320/bin/ruby_executable_hooks:15:in `<main>' 

In fact, I have two versions of bundler. I'm not an expert, but I think that "bundler (~> 1.0.0)" means bundler 1.0.x, so it gives me problem because the version is "too new" for rails. Now I'd like to understant the "correct" action to perform to make a coherent situation. Should I uninstall bundler 1.7.2? Are ruby 1.9.2 and rails 3.0 incompatible?

The main problem is that I'm new with Ruby, so maybe there is something obiouvs that I've not seen in the outputs of the commands. I've tried to google a bit, but I've found anything, so any help would be appreciated.

Thanks a lot! Lorenzo