title: Could not find nokogiri in any of the sources (Bundler::GemNotFound)
body: <p>I've already read a dozen of installation problems with nokogiri gem here, but did not find how to resolve mine.</p>
  
  <p>Gem installing proceeds without problems: <code>Successfully installed nokogiri-1.6.3.1</code>.</p>
  
  <p>But when I trying to open my rails app it says that:</p>
  
  <p><code>Could not find nokogiri-1.6.3.1 in any of the sources (Bundler::GemNotFound)</code>.</p>
  
  <p>I've tried to install an older version 1.6.1 assuming that it could be more compatible, but in that case passenger (I use nginx passenger on Ubuntu 14.04 x64) says that can't find <code>mini_portile 0.5.3</code> which is nokogiri depends on. What's going on there?</p>