title: "No extensions found" when running Visual Studio Code from source
body: <p>When I try to install any extension in Visual Studio Code (i.e., by pressing <code>Ctrl+P</code> and then running <code>ext install RustyCode</code>), I get a message that <code>No extensions found</code>.</p>
  
  <p>However, this only happens when I run VS Code directly from source repository. I.e., after:</p>
  
  <pre><code>git clone https://github.com/Microsoft/vscode.git
  cd vscode
  git checkout 1.0.0
  scripts/code.sh
  </code></pre>
  
  <p>But, if I run VS Code from <a href="https://code.visualstudio.com/#alt-downloads" rel="noreferrer">official builds</a>, then I'm able to install extensions.</p>
  
  <p>So, how can I enable downloading and installing extensions from Visual Studio Marketplace when I run VS Code directly from source repository? (Is Visual Studio Marketplace integration bundled separately in official builds?)</p>
  
  <p>I'm on Ubuntu/Linux.</p>