title: Error with install angular-cli with node-sass
body: <p>My system configuration:<br>
  debian 4.4 ,
  nvm 0.33.8 ,
  node v8.9.4 ,
  npm 5.6.0 .</p>
  
  <p>I want to install Angular-cli <code>npm install -g @angular/cli</code>.
  But I get an error message:</p>
  
  <pre><code>root@contracts:/home/kalugin# npm install -g @angular/cli
  /root/.nvm/versions/node/v8.9.4/bin/ng -&gt; /root/.nvm/versions/node/v8.9.4/lib/node_modules/@angular/cli/bin/ng
  &gt; node-sass@4.7.2 install /root/.nvm/versions/node/v8.9.4/lib/node_modules/@angular/cli/node_modules/node-sass
  &gt; node scripts/install.js
  module.js:471
    throw err;
    ^
  Error: Cannot find module '/root/.nvm/versions/node/v8.9.4/lib/node_modules/@angular/cli/node_modules/node-sass/scripts/install.js'
    at Function.Module._resolveFilename (module.js:469:15)
    at Function.Module._load (module.js:417:25)
    at Module.runMain (module.js:604:10)
    at run (bootstrap_node.js:394:7)
    at startup (bootstrap_node.js:149:9)
    at bootstrap_node.js:509:3
  &gt; uglifyjs-webpack-plugin@0.4.6 postinstall /root/.nvm/versions/node/v8.9.4/lib/node_modules/@angular/cli/node_modules/webpack/node_modules/uglifyjs-webpack-plugin
  &gt; node lib/post_install.js
  module.js:471
    throw err;
    ^
  Error: Cannot find module '/root/.nvm/versions/node/v8.9.4/lib/node_modules/@angular/cli/node_modules/webpack/node_modules/uglifyjs-webpack-plugin/lib/post_install.js'
    at Function.Module._resolveFilename (module.js:469:15)
    at Function.Module._load (module.js:417:25)
    at Module.runMain (module.js:604:10)
    at run (bootstrap_node.js:394:7)
    at startup (bootstrap_node.js:149:9)
    at bootstrap_node.js:509:3
  npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.1.3 (node_modules/@angular/cli/node_modules/fsevents):
  npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.3: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
  npm WARN optional SKIPPING OPTIONAL DEPENDENCY: node-sass@4.7.2 (node_modules/@angular/cli/node_modules/node-sass):
  npm WARN optional SKIPPING OPTIONAL DEPENDENCY: node-sass@4.7.2 install: `node scripts/install.js`
  npm WARN optional SKIPPING OPTIONAL DEPENDENCY: Exit status 1
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! uglifyjs-webpack-plugin@0.4.6 postinstall: `node lib/post_install.js`
  npm ERR! Exit status 1
  npm ERR!
  npm ERR! Failed at the uglifyjs-webpack-plugin@0.4.6 postinstall script.
  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  npm ERR! A complete log of this run can be found in:
  npm ERR!     /root/.npm/_logs/2018-02-09T17_27_50_397Z-debug.log
  </code></pre>
  
  <p>I tried <code>npm cache clean</code>, doesn't help.<br>
  I tried change node version <code>nvm use v6.12.3</code>, doesn't help.  </p>
  
  <p>debug.log pointed to the problem with <code>node-sass</code> package. 
  I tried install <code>node-sass</code> globally - but the same error. I cannot install node-sass...</p>
  
  <p>Any ideas?</p>