npm install fails on Linux

Running Ubuntu 16.04 with npm 3.5.2 & node 4.2.6..

npm install results in:-

npm WARN optional Skipping failed optional dependency /chokidar/fsevents:
npm WARN notsup Not compatible with your operating system or architecture: fsevents@1.0.11
npm ERR! Linux 4.4.0-17-generic
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "install"
npm ERR! node v4.2.6
npm ERR! npm v3.5.2
npm ERR! file sh
npm ERR! code ELIFECYCLE
npm ERR! errno ENOENT
npm ERR! syscall spawn

npm ERR! electron-prebuilt@0.34.5 postinstall: `node install.js`
npm ERR! spawn ENOENT
npm ERR!
npm ERR! Failed at the electron-prebuilt@0.34.5 postinstall script 'node install.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the electron-prebuilt package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! node install.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs electron-prebuilt
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls electron-prebuilt
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! /home/alan/Development/dropfox/upstream/dropfox/npm-debug.log