If you use SSH, the Pi doesn’t know what monitor it should use, since you’re sitting in front of another monitor, so your command should be:

DISPLAY=:0 npm start

Try that, it should work without problems.

Everything is also explained here .

Why aren’t you using PM2 to run the mirror?

Let us know whether it worked the second time round.

Please only do that if you are willing to set up your Pi all over again (Reinstalling Raspbian, etc.) should this fail, because it’s hardly ever a good idea to turn your system into a patchwork project.

Someone at stackexchange.com said this helped them in installing Node.js on their Pi 3:

curl -sL https://deb.nodesource.com/setup_6.x | sudo -E bash -
sudo apt-get install -y nodejs 
sudo apt-get install -y build-essential

Source: http://raspberrypi.stackexchange.com/questions/45319/install-newer-node-version-on-pi-3

If you’re not willing to reinstall everything, should this compromise your Raspbian setup, I would suggest waiting for other forum members’ suggestions on how to proceed.

Your mirror installation is not properly set up, I would try to fix that.

I’m not sure if the problem on your system is electron or the mirror installation, as I’m not able to use electron on my Pi I have no experience with using it. But you can try going to your MagicMirror folder and typing in: “npm install electron”, this may set things right.

If it doesn’t, maybe try a reinstall.

Then, go back to your browser window and type in “localhost:8080”

0 info it worked if it ends with ok
1 verbose cli [ ‘/usr/bin/nodejs’, ‘/usr/bin/npm’, ‘start’ ]
2 info using npm@3.10.3
3 info using node@v6.5.0
4 verbose run-script [ ‘prestart’, ‘start’, ‘poststart’ ]
5 info lifecycle magicmirror@2.0.0~prestart: magicmirror@2.0.0
6 silly lifecycle magicmirror@2.0.0~prestart: no script for prestart, continuing
7 info lifecycle magicmirror@2.0.0~start: magicmirror@2.0.0
8 verbose lifecycle magicmirror@2.0.0~start: unsafe-perm in lifecycle true
9 verbose lifecycle magicmirror@2.0.0~start: PATH: /usr/lib/node_modules/npm/bin/node-gyp-bin:/home/pi/MagicMirror/node_modules/.bin:/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/games:/usr/games
10 verbose lifecycle magicmirror@2.0.0~start: CWD: /home/pi/MagicMirror
11 silly lifecycle magicmirror@2.0.0~start: Args: [ ‘-c’, ‘electron js/electron.js’ ]
12 info lifecycle magicmirror@2.0.0~start: Failed to exec start script
13 verbose stack Error: magicmirror@2.0.0 start: electron js/electron.js
13 verbose stack spawn ENOENT
13 verbose stack at ChildProcess. (/usr/lib/node_modules/npm/lib/utils/spawn.js:33:16)
13 verbose stack at emitTwo (events.js:106:13)
13 verbose stack at ChildProcess.emit (events.js:191:7)
13 verbose stack at maybeClose (internal/child_process.js:877:16)
13 verbose stack at Process.ChildProcess._handle.onexit (internal/child_process.js:226:5)
14 verbose pkgid magicmirror@2.0.0
15 verbose cwd /home/pi/MagicMirror
16 error Linux 4.4.13-v7+
17 error argv “/usr/bin/nodejs” “/usr/bin/npm” “start”
18 error node v6.5.0
19 error npm v3.10.3
20 error file sh
21 error code ELIFECYCLE
22 error errno ENOENT
23 error syscall spawn
24 error magicmirror@2.0.0 start: electron js/electron.js
24 error spawn ENOENT
25 error Failed at the magicmirror@2.0.0 start script ‘electron js/electron.js’.
25 error Make sure you have the latest version of node.js and npm installed.
25 error If you do, this is most likely a problem with the magicmirror package,
25 error not with npm itself.
25 error Tell the author that this fails on your system:
25 error electron js/electron.js
25 error You can get information on how to open an issue for this project with:
25 error npm bugs magicmirror
25 error Or if that isn’t available, you can get their info via:
25 error npm owner ls magicmirror
25 error There is likely additional logging output above.
26 verbose exit [ 1, true ]