Installation

Please make sure

Node.js version 9.x is not supported at this time.

• Node.js

  • version 8.9.x or greater

https://hyperledger-fabric.readthedocs.io/en/release-1.1/prereqs.html

check if node is already installed and adhere to the above version

sudo apt install docker.io

sudo usermod -a -G docker $USER

restart the machine

and also https://hyperledger.github.io/composer/latest/installing/installing-prereqs.html