use apt update nodejs on Ubuntu

Use n module from npm in order to upgrade node

sudo npm cache clean -f
sudo npm install -g n
sudo n stable
sudo ln -sf /usr/local/n/versions/node//bin/node /usr/bin/node

To upgrade to latest version (and not current stable) version, you can use

sudo n latest

To undo:

sudo apt-get install --reinstall nodejs-legacy # fix /usr/bin/node
sudo n rm 6.0.0 # replace number with version of Node that was installed
sudo npm uninstall -g n

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