problem
$ npm install -g bower
npm WARN deprecated bower@1.8.2: ...psst! Your project can stop working at any moment because its dependencies can change. Prevent this by migrating to Yarn: https://bower.io/blog/2017/how-to-migrate-away-from-bower/
npm ERR! tar.unpack untar error /home/pong/.npm/bower/1.8.2/package.tgz
npm ERR! Linux 4.10.0-19-generic
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "install" "-g" "bower"
npm ERR! node v4.8.4
npm ERR! npm v2.15.11
npm ERR! path /usr/lib/node_modules/bower
npm ERR! code EACCES
npm ERR! errno -13
npm ERR! syscall mkdir
npm ERR! Error: EACCES: permission denied, mkdir '/usr/lib/node_modules/bower'
npm ERR! at Error (native)
npm ERR! { [Error: EACCES: permission denied, mkdir '/usr/lib/node_modules/bower']
npm ERR! errno: -13,
npm ERR! code: 'EACCES',
npm ERR! syscall: 'mkdir',
npm ERR! path: '/usr/lib/node_modules/bower',
npm ERR! fstream_type: 'Directory',
npm ERR! fstream_path: '/usr/lib/node_modules/bower',
npm ERR! fstream_class: 'DirWriter',
npm ERR! fstream_stack:
npm ERR! [ '/usr/lib/node_modules/npm/node_modules/fstream/lib/dir-writer.js:35:25',
npm ERR! '/usr/lib/node_modules/npm/node_modules/mkdirp/index.js:47:53',
npm ERR! 'FSReqWrap.oncomplete (fs.js:82:15)' ] }
npm ERR!
npm ERR! Please try running this command again as root/Administrator.
npm ERR! Please include the following file with any support request:
npm ERR! /home/pong/npm-debug.log
recommended Option 2: Change npm’s default directory to another directory
$ mkdir ~/.npm-global $ npm config set prefix '~/.npm-global'
put this in ~/.profile
export PATH=~/.npm-global/bin:$PATH
then update your system variables
source ~/.profile
ref : https://docs.npmjs.com/getting-started/fixing-npm-permissions
