https://github.com/creationix/nm#install-script
Acesse o site a cima para saber a versão mais recente.
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.31.2/install.sh | bash
source ~/.bashrc
nvm install 5.0
If a proxy is needed:
$ npm config set proxy http://proxy.company.com:8080
$ npm config set https-proxy http://proxy.company.com:8080