title: Error: UNABLE_TO_VERIFY_LEAF_SIGNATURE Phonegap Installation
body: <p>I'm trying to install Phonegap in Ubuntu. The installation of NodeJS was successful, however I can't install Phonegap itself. Here is the error output of terminal:</p>
  
  <pre><code>test@test-VirtualBox:~$ sudo npm install -g phonegap
  npm http GET https://registry.npmjs.org/phonegap
  npm http GET https://registry.npmjs.org/phonegap
  npm http GET https://registry.npmjs.org/phonegap
  npm ERR! Error: UNABLE_TO_VERIFY_LEAF_SIGNATURE
  npm ERR!     at SecurePair.&lt;anonymous&gt; (tls.js:1350:32)
  npm ERR!     at SecurePair.EventEmitter.emit (events.js:92:17)
  npm ERR!     at SecurePair.maybeInitFinished (tls.js:963:10)
  npm ERR!     at CleartextStream.read [as _read] (tls.js:463:15)
  npm ERR!     at CleartextStream.Readable.read (_stream_readable.js:320:10)
  npm ERR!     at EncryptedStream.write [as _write] (tls.js:366:25)
  npm ERR!     at doWrite (_stream_writable.js:219:10)
  npm ERR!     at writeOrBuffer (_stream_writable.js:209:5)
  npm ERR!     at EncryptedStream.Writable.write (_stream_writable.js:180:11)
  npm ERR!     at write (_stream_readable.js:573:24)
  npm ERR! If you need help, you may report this log at:
  npm ERR!     &lt;http://bugs.debian.org/npm&gt;
  npm ERR! or use
  npm ERR!     reportbug --attach /home/test/npm-debug.log npm
  
  npm ERR! System Linux 3.11.0-14-generic
  npm ERR! command "/usr/bin/nodejs" "/usr/bin/npm" "install" "-g" "phonegap"
  npm ERR! cwd /home/test
  npm ERR! node -v v0.10.15
  npm ERR! npm -v 1.2.18
  npm ERR! 
  npm ERR! Additional logging details can be found in:
  npm ERR!     /home/test/npm-debug.log
  npm ERR! not ok code 0
  </code></pre>
  
  <p>Any help would be appreciated.</p>