e unable to locate package npm ubuntu code example

Example 1: E: Unable to locate package npm

curl -sL https://deb.nodesource.com/setup_10.x | sudo -E bash -
sudo apt-get install -y nodejs

Example 2: unable to locate package node

curl -sL https://deb.nodesource.com/setup_10.x | sudo -E bash -
sudo apt-get install -y nodejs