You are welcome and glad it works!

1000 camels to you, good sir!

I don’t see the need of using sudo for npm install.
I’ve tried to replicate your error(took a while to undo the fixes):

npm list

npm ERR! extraneous: gulp-stylelint@3.9.0 /home/pi/MagicMirror/node_modules/gulp-stylelint
npm ERR! extraneous: stylelint@7.8.0 /home/pi/MagicMirror/node_modules/stylelint

npm purge

npm WARN grunt-stylelint@0.8.0 requires a peer of stylelint@^7.8.0 but none was installed.
npm WARN stylelint-config-standard@16.0.0 requires a peer of stylelint@^7.8.0 but none was installed.

npm rebuild
got this: coffee-script@1.10.0 should be installed with -g // npm WARN prefer global jsonlint@1.6.2 should be installed with -g

cd /MagicMirror/node_modules/
npm install  coffee-script@1.10.0 -g
npm install jsonlint@1.6.2 -g
npm install stylelint
npm install colorguard@1.2.0 -g

npm list (again yes)

you will get an error: npm ERR! extraneous: stylelint@7.10.1 /home/pi/MagicMirror/node_modules/stylelint because we instaleld manually.

Give it a try and let us know.

i@Pi:~/MagicMirror/node_modules $ sudo npm install electron

> electron@1.6.6 postinstall /home/pi/MagicMirror/node_modules/electron
> node install.js

magicmirror@2.1.1 /home/pi/MagicMirror
└── electron@1.6.6 

npm WARN grunt-stylelint@0.8.0 requires a peer of stylelint@^7.8.0 but none was installed.
npm WARN stylelint-config-standard@16.0.0 requires a peer of stylelint@^7.8.0 but none was installed.

pi@Pi:~/MagicMirror $ cd node_modules/
pi@Pi:~/MagicMirror/node_modules $ sudo npm uninstall extract-zip
- ms@0.7.1 node_modules/extract-zip/node_modules/ms
- debug@2.2.0 node_modules/extract-zip/node_modules/debug
- pend@1.2.0 node_modules/pend
- fd-slicer@1.0.1 node_modules/fd-slicer
- yauzl@2.4.1 node_modules/yauzl
- extract-zip@1.6.4 node_modules/extract-zip
npm WARN grunt-stylelint@0.8.0 requires a peer of stylelint@^7.8.0 but none was installed.
npm WARN stylelint-config-standard@16.0.0 requires a peer of stylelint@^7.8.0 but none was installed.
pi@Pi:~/MagicMirror/node_modules $ sudo npm install extract-zip@1.6.0
magicmirror@2.1.1 /home/pi/MagicMirror
└─┬ spectron@3.6.2
  └─┬ electron-chromedriver@1.6.0
    └─┬ extract-zip@1.6.0 
      ├─┬ concat-stream@1.5.0 
      │ └─┬ readable-stream@2.0.6 
      │   └── isarray@1.0.0 
      ├── debug@0.7.4 
      └─┬ yauzl@2.4.1 
        └─┬ fd-slicer@1.0.1 
          └── pend@1.2.0 

npm WARN grunt-stylelint@0.8.0 requires a peer of stylelint@^7.8.0 but none was installed.
npm WARN stylelint-config-standard@16.0.0 requires a peer of stylelint@^7.8.0 but none was installed.
pi@Pi:~/MagicMirror/node_modules $ sudo npm install electron

> electron@1.6.6 postinstall /home/pi/MagicMirror/node_modules/electron
> node install.js

Sorry to hear that.

For me it worked with those dependencies fixed.

pi@raspberrypi:~$ npm -v ; node -v
4.1.2
v7.7.1
pi@raspberrypi:~$ cd MagicMirror/
pi@raspberrypi:~/MagicMirror$ cd node_modules/
pi@raspberrypi:~/MagicMirror/node_modules$ npm install electron

> electron@1.6.6 postinstall /home/pi/MagicMirror/node_modules/electron
> node install.js

magicmirror@2.1.1 /home/pi/MagicMirror
└── electron@1.6.6

pi@raspberrypi:~/MagicMirror/node_modules$

Here the thread I’ve been looking last night: https://github.com/electron/electron/issues/9324
User: johannesjo made a fork: https://github.com/johannesjo/electron-prebuilt

But what I did was to downgrade the extract-zip:

pi@raspberrypi:~$ cd MagicMirror/
pi@raspberrypi:~/MagicMirror$ cd node_modules/
pi@raspberrypi:~/MagicMirror/node_modules$ npm uninstall extract-zip
.
.
.
pi@raspberrypi:~/MagicMirror/node_modules$ npm install extract-zip@1.6.0
.
.
.
pi@raspberrypi:~/MagicMirror/node_modules$ npm install electron

As a result of all this:

pi@raspberrypi:~/MagicMirror$ npm install

> magicmirror@2.1.1 install /home/pi/MagicMirror
> cd vendor && npm install

magicmirror-vendors@ /home/pi/MagicMirror/vendor
├── font-awesome@4.7.0
├── moment@2.18.1
├── moment-timezone@0.5.13
└── weathericons@2.1.0


> magicmirror@2.1.1 postinstall /home/pi/MagicMirror
> sh installers/postinstall/postinstall.sh

MagicMirror installation successful!
pi@raspberrypi:~/MagicMirror$

Hope it helps

https://forum.magicmirror.builders/topic/2460/magicmirror-fails-to-install-during-electron-installation

Those steps didn’t help.

0 info it worked if it ends with ok
1 verbose cli [ '/usr/bin/nodejs', '/usr/bin/npm', 'start' ]
2 info using npm@4.5.0
3 info using node@v6.10.2
4 verbose run-script [ 'prestart', 'start', 'poststart' ]
5 info lifecycle magicmirror@2.1.1~prestart: magicmirror@2.1.1
6 silly lifecycle magicmirror@2.1.1~prestart: no script for prestart, continuing
7 info lifecycle magicmirror@2.1.1~start: magicmirror@2.1.1
8 verbose lifecycle magicmirror@2.1.1~start: unsafe-perm in lifecycle true
9 verbose lifecycle magicmirror@2.1.1~start: PATH: /usr/lib/node_modules/npm/bin/node-gyp-bin:/home/pi/MagicMirror/node_modules/.bin:/usr/local/sbin$
10 verbose lifecycle magicmirror@2.1.1~start: CWD: /home/pi/MagicMirror
11 silly lifecycle magicmirror@2.1.1~start: Args: [ '-c', 'sh run-start.sh' ]
12 info lifecycle magicmirror@2.1.1~start: Failed to exec start script
13 verbose stack Error: magicmirror@2.1.1 start: `sh run-start.sh`
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:886:16)
13 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:226:5)
14 verbose pkgid magicmirror@2.1.1
15 verbose cwd /home/pi/MagicMirror
16 verbose Linux 4.9.24-v7+
17 verbose argv "/usr/bin/nodejs" "/usr/bin/npm" "start"
18 verbose node v6.10.2
19 verbose npm  v4.5.0
20 error file sh
21 error code ELIFECYCLE
22 error errno ENOENT
23 error syscall spawn
24 error magicmirror@2.1.1 start: `sh run-start.sh`
24 error spawn ENOENT
25 error Failed at the magicmirror@2.1.1 start script 'sh run-start.sh'.
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     sh run-start.sh
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 ]

/root/.npm/_logs/2017-05-01T03_24_28_075Z-debug.log

Open this file
/root/.npm/_logs/2017-05-01T03_24_28_075Z-debug.log

See what it’s telling you…

I really do have to go to bed … have to get up early but don’t give up…

pi@Pi:~ $ sudo apt-get install nodejs
Reading package lists... Done
Building dependency tree
Reading state information... Done
nodejs is already the newest version.
The following packages were automatically installed and are no longer required:
  libc-ares2 libv8-3.14.5
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
pi@Pi:~ $ git clone https://github.com/MichMich/MagicMirror
Cloning into 'MagicMirror'...
remote: Counting objects: 7394, done.
remote: Total 7394 (delta 0), reused 0 (delta 0), pack-reused 7394
Receiving objects: 100% (7394/7394), 11.00 MiB | 492.00 KiB/s, done.
Resolving deltas: 100% (4086/4086), done.
Checking connectivity... done.
pi@Pi:~ $ cd MagicMirror/
pi@Pi:~/MagicMirror $ sudo npm install && npm start
npm WARN prefer global coffee-script@1.10.0 should be installed with -g
npm WARN prefer global jsonlint@1.6.2 should be installed with -g

> electron-chromedriver@1.6.0 install /home/pi/MagicMirror/node_modules/electron-chromedriver
> node ./download-chromedriver.js


> electron@1.6.6 postinstall /home/pi/MagicMirror/node_modules/electron
> node install.js

/home/pi/MagicMirror/node_modules/electron/install.js:47
  throw err
  ^

Error: ENOENT: no such file or directory, lstat '/home/pi/MagicMirror/node_modules/electron/dist/resources'
    at Error (native)

npm WARN grunt-stylelint@0.8.0 requires a peer of stylelint@^7.8.0 but none was installed.
npm WARN stylelint-config-standard@16.0.0 requires a peer of stylelint@^7.8.0 but none was installed.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! electron@1.6.6 postinstall: `node install.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the electron@1.6.6 postinstall script 'node install.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the electron package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     node install.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs electron
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls electron
npm ERR! There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2017-05-01T03_24_28_075Z-debug.log

npm install && npm start

Ok, trying now.

Install manually.

Manual Installation

• Download and install the latest Node.js version.
• Clone the repository and check out the master branch: git clone https://github.com/MichMich/MagicMirror
• Enter the repository: cd ~/MagicMirror
• Install and run the app: npm install && npm start
• Important: npm start does not work via SSH, use DISPLAY=:0 nohup npm start & instead. This starts the mirror on the remote display.

Note: if you want to debug on Raspberry Pi you can use npm start dev which will start the MagicMirror app with Dev Tools enabled.

npm install npm@latest -g
npm install -g grunt
npm install -g electron

and when installing electron I get

pi@Pi:~ $ sudo npm install -g electron
/usr/bin/electron -> /usr/lib/node_modules/electron/cli.js

> electron@1.6.6 postinstall /usr/lib/node_modules/electron
> node install.js

/usr/lib/node_modules/electron/install.js:47
  throw err
  ^

Error: ENOENT: no such file or directory, lstat '/usr/lib/node_modules/electron/dist/resources'
    at Error (native)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! electron@1.6.6 postinstall: `node install.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the electron@1.6.6 postinstall script 'node install.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the electron package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     node install.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs electron
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls electron
npm ERR! There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2017-05-01T02_57_00_518Z-debug.log