Hello
I meet the same issue.
I have run the installation bash on a fresh newly setup raspberry pi 3 B.
After this error, I tried to installa previous version of electron
sudo npm install -g electron@1.7.6
Error log is the same :
(node:1853) [DEP0022] DeprecationWarning: os.tmpDir() is deprecated. Use os.tmpdir() instead.
npm ERR! Error: Method Not Allowed
npm ERR! at errorResponse (/usr/share/npm/lib/cache/add-named.js:260:10)
npm ERR! at /usr/share/npm/lib/cache/add-named.js:203:12
npm ERR! at saved (/usr/share/npm/node_modules/npm-registry-client/lib/get.js:167:7)
npm ERR! at FSReqWrap.oncomplete (fs.js:135:15)
npm ERR! If you need help, you may report this *entire* log,
npm ERR! including the npm and node versions, at:
npm ERR! <http://github.com/npm/npm/issues>
npm ERR! System Linux 4.14.79-v7+
npm ERR! command "/usr/bin/node" "/usr/bin/npm" "install" "-g" "electron@1.7.6"
npm ERR! cwd /home/pi/MagicMirror
npm ERR! node -v v8.11.1
npm ERR! npm -v 1.4.21
npm ERR! code E405
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR! /home/pi/MagicMirror/npm-debug.log
npm ERR! not ok code 0
If you find some answer to this issue, I will be glad to setup my mirror.