相关疑难解决方法(0)

我在AWS EC2中获得了一个Ubuntu 12.04实例.
我只想要宝石安装rails.
但它显示此错误消息.
这是由sudo gem env之间的差异gem env引起的吗？
除了rvm implode之外,还有什么方法可以解决这个问题吗？
使用rvmsudo的风险是什么？

Fetching: atomic-1.1.15.gem (100%)
ERROR:  While executing gem ... (Gem::FilePermissionError)
You don't have write permissions for the /usr/local/rvm/gems/ruby-1.9.3-p545@global directory.

宝石环境:

RubyGems Environment:
  - RUBYGEMS VERSION: 2.2.2
  - RUBY VERSION: 1.9.3 (2014-02-24 patchlevel 545) [x86_64-linux]
  - INSTALLATION DIRECTORY: /usr/local/rvm/gems/ruby-1.9.3-p545@global
  - RUBY EXECUTABLE: /usr/local/rvm/rubies/ruby-1.9.3-p545/bin/ruby
  - EXECUTABLE DIRECTORY: /usr/local/rvm/gems/ruby-1.9.3-p545@global/bin
  - SPEC CACHE DIRECTORY: /home/ubuntu/.gem/specs
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-linux
  - GEM PATHS:
     - /usr/local/rvm/gems/ruby-1.9.3-p545@global
  - GEM CONFIGURATION:
     - :update_sources => …