title: ng-serve is not working on ubuntu
body: <pre><code>ng serve 
  You seem to not be depending on "@angular/core". This is an error.
  </code></pre>
  
  <p>It gives that error.</p>
  
  <pre><code>ls
  hello-world  node_modules  package.json  package-lock.json
  
  ng -v    
  
      _                      _                 ____ _     ___
     / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
    / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
   / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
  /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                 |___/
  
  Angular CLI: 1.6.1
  Node: 9.2.1
  OS: linux x64
  Angular: undefined
  ... 
  
  @angular/cli: 1.6.1
  @angular-devkit/build-optimizer: 0.0.36
  @angular-devkit/core: 0.0.22
  @angular-devkit/schematics: 0.0.42
  @ngtools/json-schema: 1.1.0
  @ngtools/webpack: 1.9.1
  @schematics/angular: 0.1.11
  @schematics/schematics: 0.0.11
  typescript: 2.6.2
  webpack: 3.10.0
  </code></pre>
  
  <p>I tried to reinstall npm and cache clean but it did not work.</p>
  
  <p>Some of my commands:</p>
  
  <pre><code> 5880  mkdir hello-world
   5881  cd hello-world
   5882  ng new hello-world
   5883  ng serve
   5884  sudo npm install
   5885  ng serve
   5886  ls
   5887  npm init
   5888  ls
   5889  ng serve
   5890  npm install
   5891  ng serve
   5892  npm install --save-dev @angular/cli@latest
   5893  ng serve
   5894  npm install\n
   5895  ng serve
   5896  npm i
   5897  ng serve
   5898  ls
   5899  sudo rm -rf  node_modules
   5900  em package-lock.json
   5901  rm package-lock.json
   5902  npm update
   5903  ng serve
   5904  ls
   5905  npm cache clean 
   5906  sudo npm cache clean 
   5907  sudo npm rebuild
   5908  ng serve
   5909  npm install
   5910  ng serve
   5911  ls
   5912  npm update
   5913  ls
   5914  ng serve
   5915  sudo npm install
   5916  ng serve
   5917  sudo npm update
   5918  ng serve
   5919  ls
   5920  cd
   5921  cd Projects/hello-world/
   5922  ng
   5923  ng -serve
   5924  ng -
   5925  ng -v
   5926  ls
   5927  vi node_modules
   5928  ls
   5929  npm cache clean --force\nnpm cache verify\nnpm i
   5930  ng -serve
   5931  s
   5932  ls
   5933  ng -v
   5934  npm init
   5935  ng -v
   5936  ng -serve
   5937  sudo npm uninstall -g @angular/cli
   5938  sudo npm install -g @angular/cli
   5939  ng serve
   5940  ls
   5941  ng -v
  </code></pre>
  
  <p>I want to install angularcli, angular version 1, but could not manage it.</p>