ubuntu

$ sudo npm install

[... installs a couple of packages ...]

npm WARN optional Skipping failed optional dependency /karma/chokidar/fsevents:
npm WARN notsup Not compatible with your operating system or architecture: fsevents@1.0.17
npm WARN optional Skipping failed optional dependency /watchify/chokidar/fsevents:
npm WARN notsup Not compatible with your operating system or architecture: fsevents@1.0.17
npm ERR! Linux 4.4.0-31-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! phantomjs-prebuilt@2.1.14 install: `node install.js`
npm ERR! spawn ENOENT
npm ERR!
npm ERR! Failed at the phantomjs-prebuilt@2.1.14 install 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 phantomjs-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 phantomjs-prebuilt
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls phantomjs-prebuilt
npm ERR! There is likely additional logging output above.