安装 Rails 版本 3.2.15 时出现“Gem::RemoteFetcher::UnknownHostError”

我之前已经在实时 ubuntu USB 上成功安装了 Rails 3.2.15 并具有数据持久性。

现在我已经习惯了操作系统（Ubuntu 12.04 LTS），我已经将它安装在笔记本电脑上，并且正在安装我在实时 USB 中使用的东西。

长话短说，我在安装 Rails 时遇到问题。我使用了与 live USB 中相同的说明来安装 ruby​​ 和rails：http://ryanbigg.com/2010/12/ubuntu-ruby-rvm-rails-and-you/ http://ryanbigg.com/2010/12/ubuntu-ruby-rvm-rails-and-you/

但是，我在安装 Rails 时遇到此错误：

错误：执行 gem 时... (Gem::RemoteFetcher::UnknownHostError) 没有这个名字（https://api.rubygems.org/api/v1/dependency?gems=activemodel https://api.rubygems.org/api/v1/dependencies?gems=activemodel)

我已经使用 -V 来查看发生了什么，但是作为一名技术菜鸟，我不知道出了什么问题。

这是 -V 给出的内容：

~$ gem 安装rails -V 3.2.15 HEADhttps://api.rubygems.org/latest_specs.4.8.gz https://api.rubygems.org/latest_specs.4.8.gz第302章 暂时搬家 头https://s3.amazonaws.com/production.s3.rubygems.org/latest_specs.4.8.gz https://s3.amazonaws.com/production.s3.rubygems.org/latest_specs.4.8.gz200 确定 获取https://api.rubygems.org/latest_specs.4.8.gz https://api.rubygems.org/latest_specs.4.8.gz302 搬家 暂时GEThttps://s3.amazonaws.com/production.s3.rubygems.org/latest_specs.4.8.gz https://s3.amazonaws.com/production.s3.rubygems.org/latest_specs.4.8.gz200 好头https://api.rubygems.org/latest_specs.4.8.gz https://api.rubygems.org/latest_specs.4.8.gz302 搬家 暂时头部https://s3.amazonaws.com/production.s3.rubygems.org/latest_specs.4.8.gz https://s3.amazonaws.com/production.s3.rubygems.org/latest_specs.4.8.gz304 未修改 GEThttps://api.rubygems.org/quick/Marshal.4.8/rails-4.0.2.gemspec.rz https://api.rubygems.org/quick/Marshal.4.8/rails-4.0.2.gemspec.rz第302章 暂时移动 GEThttps://bb-m.rubygems.org/quick/Marshal.4.8/rails-4.0.2.gemspec.rz https://bb-m.rubygems.org/quick/Marshal.4.8/rails-4.0.2.gemspec.rz200 好头https://api.rubygems.org/api/v1/dependencies https://api.rubygems.org/api/v1/dependencies302 搬家 暂时头部https://bundler.rubygems.org/api/v1/dependencies https://bundler.rubygems.org/api/v1/dependencies200 好头https://api.rubygems.org/api/v1/dependencies https://api.rubygems.org/api/v1/dependencies302 搬家 暂时头部https://bundler.rubygems.org/api/v1/dependencies https://bundler.rubygems.org/api/v1/dependencies200 确定获取https://api.rubygems.org/api/v1/dependency?gems=rails https://api.rubygems.org/api/v1/dependencies?gems=rails第302章 暂时移动 GEThttps://bundler.rubygems.org/api/v1/dependencies?gems=rails https://bundler.rubygems.org/api/v1/dependencies?gems=rails200 确定 获取https://api.rubygems.org/api/v1/dependency?gems=rails https://api.rubygems.org/api/v1/dependencies?gems=rails302 搬家 暂时GEThttps://bundler.rubygems.org/api/v1/dependencies?gems=rails https://bundler.rubygems.org/api/v1/dependencies?gems=rails200 确定 获取https://api.rubygems.org/api/v1/dependency?gems=railties https://api.rubygems.org/api/v1/dependencies?gems=railties302 搬家 暂时GEThttps://bundler.rubygems.org/api/v1/dependencies?gems=railties https://bundler.rubygems.org/api/v1/dependencies?gems=railties200 好 得到https://api.rubygems.org/api/v1/dependency?gems=railties https://api.rubygems.org/api/v1/dependencies?gems=railties第302章 暂时移动 GEThttps://bundler.rubygems.org/api/v1/dependencies?gems=railties https://bundler.rubygems.org/api/v1/dependencies?gems=railties200 好 得到https://api.rubygems.org/api/v1/dependencies?gems=actionmailer https://api.rubygems.org/api/v1/dependencies?gems=actionmailer第302章 暂时移动 GEThttps://bundler.rubygems.org/api/v1/dependencies?gems=actionmailer https://bundler.rubygems.org/api/v1/dependencies?gems=actionmailer200 确定获取https://api.rubygems.org/api/v1/dependencies?gems=actionmailer https://api.rubygems.org/api/v1/dependencies?gems=actionmailer第302章 暂时移动GEThttps://bundler.rubygems.org/api/v1/dependencies?gems=actionmailer https://bundler.rubygems.org/api/v1/dependencies?gems=actionmailer200 确定获取https://api.rubygems.org/api/v1/dependencies?gems=activerecord https://api.rubygems.org/api/v1/dependencies?gems=activerecord第302章 暂时移动GEThttps://bundler.rubygems.org/api/v1/dependencies?gems=activerecord https://bundler.rubygems.org/api/v1/dependencies?gems=activerecord200 确定获取https://api.rubygems.org/api/v1/dependencies?gems=activerecord https://api.rubygems.org/api/v1/dependencies?gems=activerecord第302章 暂时移动GEThttps://bundler.rubygems.org/api/v1/dependencies?gems=activerecord https://bundler.rubygems.org/api/v1/dependencies?gems=activerecord200 确定获取https://api.rubygems.org/api/v1/dependency?gems=actionpack https://api.rubygems.org/api/v1/dependencies?gems=actionpack第302章 暂时移动GEThttps://bundler.rubygems.org/api/v1/dependencies?gems=actionpack https://bundler.rubygems.org/api/v1/dependencies?gems=actionpack200 确定获取https://api.rubygems.org/api/v1/dependency?gems=actionpack https://api.rubygems.org/api/v1/dependencies?gems=actionpack第302章 暂时移动GEThttps://bundler.rubygems.org/api/v1/dependencies?gems=actionpack https://bundler.rubygems.org/api/v1/dependencies?gems=actionpack200 确定获取https://api.rubygems.org/api/v1/dependencies?gems=activesupport https://api.rubygems.org/api/v1/dependencies?gems=activesupport第302章 暂时移动GEThttps://bundler.rubygems.org/api/v1/dependencies?gems=activesupport https://bundler.rubygems.org/api/v1/dependencies?gems=activesupport200 确定 获取https://api.rubygems.org/api/v1/dependencies?gems=activesupport https://api.rubygems.org/api/v1/dependencies?gems=activesupport第302章 暂时移动 GEThttps://bundler.rubygems.org/api/v1/dependencies?gems=activesupport https://bundler.rubygems.org/api/v1/dependencies?gems=activesupport200 确定 获取https://api.rubygems.org/api/v1/dependency?gems=activemodel https://api.rubygems.org/api/v1/dependencies?gems=activemodel第302章 暂时移动 GEThttps://bundler.rubygems.org/api/v1/dependencies?gems=activemodel https://bundler.rubygems.org/api/v1/dependencies?gems=activemodel200 OK 错误：执行 gem 时... (Gem::RemoteFetcher::UnknownHostError) 没有这个名字（https://api.rubygems.org/api/v1/dependency?gems=activemodel https://api.rubygems.org/api/v1/dependencies?gems=activemodel)

任何人都可以帮忙吗？

附加信息：

using:

ruby 2.1.0p0（2013-12-25 修订版 44422）[i686-linux]

rvm 1.25.15（稳定），作者：Wayne E. Seguin、Michal Papis [https://rvm.io/]

我遇到了同样的问题：Ubuntu 12.04，ruby 2.1.0 尝试安装最新的rails（4.0.x）。正在做宝石安装导轨我遇到了同样的错误。我做了什么：

• 更新红宝石：宝石更新--系统从 2.2.0 到 2.2.2
• 找到过时的宝石（宝石已过时）并得到了一些过时的：bigdecimal（1.2.3
• 更新了宝石宝石更新
• 已成功安装导轨gem install Rails --no-ri --no-rdoc

At rails -v我得到了 Rails 4.0.3。