Gave up and did a git reset --hard, and that fixed it.

That did not help me.
Tried to remove and uninstall and re setup and is now with this. Si I think i broke something :\

 DISPLAY=:0 npm start

> magicmirror@2.1.1 start /home/pi/MagicMirror
> sh run-start.sh

App threw an error during load
Error: Cannot find module '/home/pi/MagicMirror/js/../modules/default/defaultmodules.js'
    at Module._resolveFilename (module.js:470:15)
    at Function.Module._resolveFilename (/home/pi/MagicMirror/node_modules/electron/dist/resources/electron.asar/common/reset-search-paths.js:35:12)
    at Function.Module._load (module.js:418:25)
    at Module.require (module.js:498:17)
    at require (internal/module.js:20:19)
    at Object. (/home/pi/MagicMirror/js/app.js:11:22)
    at Object. (/home/pi/MagicMirror/js/app.js:243:3)
    at Module._compile (module.js:571:32)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:488:32)
A JavaScript error occurred in the main process
Uncaught Exception:
Error: Cannot find module '/home/pi/MagicMirror/js/../modules/default/defaultmodules.js'
    at Module._resolveFilename (module.js:470:15)
    at Function.Module._resolveFilename (/home/pi/MagicMirror/node_modules/electron/dist/resources/electron.asar/common/reset-search-paths.js:35:12)
    at Function.Module._load (module.js:418:25)
    at Module.require (module.js:498:17)
    at require (internal/module.js:20:19)
    at Object. (/home/pi/MagicMirror/js/app.js:11:22)
    at Object. (/home/pi/MagicMirror/js/app.js:243:3)
    at Module._compile (module.js:571:32)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:488:32)

Really new to MM and installed my first setup yesterday. Today it popped up a notification to upgrade it, so i did that according to the wiki and everything died :).

npm log looks like this:

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@v6.10.1
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 v6.10.1
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 ]

Anyone that can give me any hints on fixing this, because right now I’m lost.