Why my Ubuntu still claims the version of Ruby on Rails is 4.0.0 after explicitly uninstalling it and installing the previous one? -

test@test-virtualbox:~$ sudo gem uninstall rails [sudo] password test:  uninstalled rails-4.0.0 test@test-virtualbox:~$ rails -v rails 4.0.0  test@test-virtualbox:~$ sudo gem install rails -v 3.2.11 [sudo] password test:  installed rails-3.2.11 test@test-virtualbox:/home$ rails -v rails 4.0.0  test@test-virtualbox:~$ sudo gem uninstall rails -v 4.0.0 info:  gem "rails" not installed  test@test-virtualbox:~$ sudo gem uninstall rails -v 3.2.11     have requested uninstall gem: rails-3.2.11 gmaps4rails-1.5.6 depends on [rails (~> 3.2.1)] if remove gems, 1 or more dependencies not met. continue uninstall? [yn]   

why?

for it's worth, below supplementary info.

test@test-virtualbox:~$ gem list rails *** local gems *** rails (4.0.0) test@test-virtualbox:~$  test@test-virtualbox:~$ sudo rails -v rails 4.0.0 test@test-virtualbox:~$ rails -v rails 4.0.0 

gemfile

# bundle edge rails instead: gem 'rails', github: 'rails/rails' gem 'rails', '4.0.0' 

try using this:

gem install rails # no sudo 

most folks know using rvm (or rbenv) though: https://rvm.io/