“running “sudo npm install electron” (after the error message) in the terminal on the gui it worked starting in the terminal on the gui.”

I have also this code showing up when I want to install MagicMirror, thoughts ?

Check current Node installation ...
Node currently installed. Checking version number.
Minimum Node version: v5.1.0
Installed Node version: v6.10.2
No Node.js upgrade nessecery.
It seems like MagicMirror is already installed.
To prevent overwriting, the installer will be aborted.
Please rename the ~/MagicMirror folder and try again.

@gshimself thanks for your help, here is the code i got from the debug log

0 info it worked if it ends with ok
1 verbose cli [ '/usr/bin/nodejs', '/usr/bin/npm', 'start' ]
2 info using npm@3.10.10
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:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/games:/usr/games
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 silly lifecycle magicmirror@2.1.1~start: Returned: code: 1  signal: null
13 info lifecycle magicmirror@2.1.1~start: Failed to exec start script
14 verbose stack Error: magicmirror@2.1.1 start: `sh run-start.sh`
14 verbose stack Exit status 1
14 verbose stack     at EventEmitter. (/usr/lib/node_modules/npm/lib/utils/lifecycle.js:255:16)
14 verbose stack     at emitTwo (events.js:106:13)
14 verbose stack     at EventEmitter.emit (events.js:191:7)
14 verbose stack     at ChildProcess. (/usr/lib/node_modules/npm/lib/utils/spawn.js:40:14)
14 verbose stack     at emitTwo (events.js:106:13)
14 verbose stack     at ChildProcess.emit (events.js:191:7)
14 verbose stack     at maybeClose (internal/child_process.js:886:16)
14 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:226:5)
15 verbose pkgid magicmirror@2.1.1
16 verbose cwd /home/pi/MagicMirror
17 error Linux 4.4.50-v7+
18 error argv "/usr/bin/nodejs" "/usr/bin/npm" "start"
19 error node v6.10.2
20 error npm  v3.10.10
21 error code ELIFECYCLE
22 error magicmirror@2.1.1 start: `sh run-start.sh`
22 error Exit status 1
23 error Failed at the magicmirror@2.1.1 start script 'sh run-start.sh'.
23 error Make sure you have the latest version of node.js and npm installed.
23 error If you do, this is most likely a problem with the magicmirror package,
23 error not with npm itself.
23 error Tell the author that this fails on your system:
23 error     sh run-start.sh
23 error You can get information on how to open an issue for this project with:
23 error     npm bugs magicmirror
23 error Or if that isn't available, you can get their info via:
23 error     npm owner ls magicmirror
23 error There is likely additional logging output above.
24 verbose exit [ 1, true ]

sudo cat /home/pi/MagicMirror/npm-debug.log

and post some of that code?