Signal K update failured

[Mitch C]

A reinstall of node.js and sk server should get you back on track.

1) create a backup of your disk and/or the files under $HOME/.signalk (except node_modules if you want to save space)

2) https://github.com/SignalK/signalk-serve...-Questions

3) https://github.com/SignalK/signalk-serve...ng-Node.js

Thanks for the reply, tried the advice in the SignalK guide, but no fet:
npm install -g signalk-server
bash: npm: command not found

It seems npm is not installed. What do I do next?