title: nvm tar: Unrecognized archive format
body: <p><strong>Greetings Everybody!</strong></p>
  
  <p>I had this problem while installing <code>node</code> via <code>nvm</code></p>
  
  <p>when i type:</p>
  
  <p><code>$ nvm install 5.5.0</code></p>
  
  <p>had this:</p>
  
  <pre><code>Downloading https://nodejs.org/dist/v5.5.0/node-v5.5.0-darwin-x86.tar.xz...
  ######################################################################## 100.0%
  WARNING: checksums are currently disabled for node.js v4.0 and later
  tar: Unrecognized archive format
  tar: Error exit delayed from previous errors.
  Binary download failed, trying source.
  ######################################################################## 100.0%
  Checksums empty
  tar: Unrecognized archive format
  tar: Error exit delayed from previous errors.
  Binary download failed, trying source.
  Installing node v1.0 and greater from source is not currently supported
  </code></pre>
  
  <p>so main problem is there: <code>tar: Unrecognized archive format</code>
  because(maybe) file format is: <code>tar.xz</code></p>