nodejs vs node on ubuntu 12.04

Question

I installed nodejs on ubuntu from instructions given here

When I write node --version in the terminal I see this :
-bash: /usr/sbin/node: No

Answer 1

It's optional to remove the existing node and nodejs, but have to do alternatively install the latest 7.x nodejs.

curl -sL https://deb.nodesource.com/setup_7.x | sudo -E bash -
sudo apt-get install -y nodejs