Good security practice means not logging in directly as root, which means that the installer for eFa won't run as the standard command.
It's simple to get it to work though rather than switching to the root account or having to force a root password change in order to switch using su...
sudo curl -sSL https://install.efa-project.org |sudo bash
The first sudo isn't really necessary, just force of habit, but it gets the job done. the sudo after the pipe IS necessary though.
easy!
--Andrew