Solved:
The steps I followed:'
curl -sL -o node.tgz https://unofficial-builds.nodejs.org/download/release/v12.16.2/node-v12.16.2-linux-x86.tar.gz
sudo tar -zxf node.tgz --strip-components=1 -C /usr
and then the normal script of node red.
Works fine !
Thanks, everyone!