It's a one liner in your vagrant file:

config.ssh.forward_agent = true

sudo apt purge nodejs npm

curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.8/install.sh | bash

exit

Open new terminal

I'm very comfortable with Scotchbox as Vagrantbox for my local development.

I've messed up my nodejs / gulp / browsersync setup at my development notebook.