Install NPM

Setup with Ubuntu:

curl -sL https://deb.nodesource.com/setup_5.x | sudo -E bash -

Then install with Ubuntu:

sudo apt-get install --yes nodejs

Increase Swap

The memory of my slice is only 512MB ram, so I ended up needing to increase the size of the swap in order for NPM to run correctly.

dd if=/dev/zero of=/swapfile bs=1024 count=SIZE
chmod 600 /swapfile
mkswap /swapfile
swapon /swapfile