我想在rasspberry pi 3上安装pm2：
npm install -g pm2
但我得到这个错误：
(node:5118) [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 4.9.59-v7+
npm ERR! command "/usr/bin/node" "/usr/bin/npm" "install" "-g" "pm2"
npm …