Ruby Heroku教程foreman崩溃（ubuntu）

在Ubuntu 14.10上进行了一次干净的安装后，在本地启动了该应用程序，但foreman崩溃了：

$ foreman start web
/usr/lib/ruby/2.1.0/rubygems/dependency.rb:298:in `to_specs': Could not find 'foreman' (>= 0) among 14 total gem(s) (Gem::LoadError)
    from /usr/lib/ruby/2.1.0/rubygems/dependency.rb:309:in `to_spec'
    from /usr/lib/ruby/2.1.0/rubygems/core_ext/kernel_gem.rb:53:in `gem'
    from /usr/local/bin/foreman:23:in `<main>'

$foreman启动web
/usr/lib/ruby/2.1.0/rubygems/dependency.rb:298:in'to_specs'：在总共14个gem中找不到'foreman'（>=0）（gem:：LoadError）
from/usr/lib/ruby/2.1.0/rubygems/dependency.rb:309:in'to_spec'
from/usr/lib/ruby/2.1.0/rubygems/core\u ext/kernel\u gem.rb:53:in'gem'
from/usr/local/bin/foreman:23:in`'

---

出什么事了？？？

这有点棘手。看起来赫罗库是个半职工头。以下是我尝试的错误消息：

sudo gem install foreman

现在foreman没有撞车就跑了