The npm: command not found error may appear even if you already have installed npm. It might look like

bash: npm: command not found

or

sudo: npm: command not found

or

npm: command not found

Solution

Either way the easiest solution is just run the following command:

  • if you are logged in as root user
apt-get install npm
  • if you are not root user
sudo apt-get install npm

 

This command will re-install npm and will update is’s path in the system to the correct one.