Help! I’m a complete noob trying to go through the installation tutorial. https://forum.magicmirror.builders/topic/236/complete-setup-tutorial/6 but it’s complaining about node install.js I tried updating npm but still get this:

magicmirror@2.1.3 start /home/pi/MagicMirror
sh run-start.sh

run-start.sh: 4: run-start.sh: electron: not found
npm ERR! file sh
npm ERR! code ELIFECYCLE
npm ERR! errno ENOENT
npm ERR! syscall spawn
npm ERR! magicmirror@2.1.3 start: sh run-start.sh
npm ERR! spawn ENOENT
npm ERR!
npm ERR! Failed at the magicmirror@2.1.3 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! /home/pi/.npm/_logs/2018-01-01T01_22_06_331Z-debug.log

Any suggestions in extremely plain English very welcome. Thanks and happy New Year.