Use following set of commands to add node.js ppa in your Ubuntu system and install it.
$ sudo apt-get install python-software-properties $ curl -sL https://deb.nodesource.com/setup_6.x | sudo -E bash - $ sudo apt-get install nodejs
Make sure you have successfully installed node.js and npm on your system
$ node --version $ npm --version
Now use following command to install grunt and grunt cli using npm command line utility.
$ sudo npm install -g grunt
After successful installation make sure grunt has been installed successful and check version.
$ grunt --version