Installing bower, gulp, npm, nodejs on ubuntu. #linux

install-nodejs-bower-gulp.bash

# First install 'nodejs' (not node, and don't use apt install nodejs, because it's not latest version).
# https://nodejs.org/en/download/package-manager/#debian-and-ubuntu-based-linux-distributions
curl -sL https://deb.nodesource.com/setup_4.x | sudo -E bash -
sudo apt-get install -y nodejs

# and then npm (if it's not installed automatically):
# https://rtcamp.com/tutorials/nodejs/node-js-npm-install-ubuntu/

# Then install bower and gulp with simple npm install command (with -g flag).
# For accessing bower in global space (or adding it to path) create a symbolic link:
# http://stackoverflow.com/questions/21491996/installing-bower-on-ubuntu

# Also for libsass, just install node-sass (both for global and local) by npm.
npm install node-sass

If node version is still 0.10 open synaptic and search for nodejs. If it's not installed, mark for installation.
Then run which node in terminal and rm -rf node npm in that folder to remove old npm symlinks.

Also maybe this help: http://askubuntu.com/questions/594656/how-to-install-the-latest-versions-of-nodejs-and-npm-for-ubuntu-14-04-lts