Setting up the chapter 6 example

Hi, I'm trying to set up the chapter 6 example.

I tried and got errors as follows. How can I fix this?
$ npm -v
3.10.10
$ ng -v
    _                      _                 ____ _     ___
   / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
  / ? \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
 / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
/_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
               |___/
@angular/cli: 1.0.0-rc.0
node: 6.10.2
os: linux x64
$ git clone -b start https://github.com/angular-in-action/community.git
Cloning into 'community'...
remote: Counting objects: 361, done.
remote: Compressing objects: 100% (97/97), done.
remote: Total 361 (delta 52), reused 0 (delta 0), pack-reused 263
Receiving objects: 100% (361/361), 122.52 KiB | 0 bytes/s, done.
Resolving deltas: 100% (208/208), done.
Checking connectivity... done.
$ cd community/
$ npm install
[   ...............] / cloneCurrentTree: sill cloneCurrentTree Finishing
npm ERR! fetch failed http://build-artifactory.eng.vmware.com:80/artifactory/api/npm/npm/core-js/-/core-js-2.4.1.tgz
npm WARN retry will retry, error on last attempt: Error: getaddrinfo ENOTFOUND build-artifactory.eng.vmware.com build-artifactory.en
g.vmware.com:80
npm ERR! fetch failed https://build-artifactory.eng.vmware.com/artifactory/api/npm/npm/abbrev/-/abbrev-1.1.0.tgz
npm WARN retry will retry, error on last attempt: Error: getaddrinfo ENOTFOUND build-artifactory.eng.vmware.com build-artifactory.en
g.vmware.com:443
[   ...............] | cloneCurrentTree: WARN retry will retry, error on last attempt: Error: getaddrinfo ENOTFOUND build-artifac
[   ...............] / cloneCurrentTree: WARN retry will retry, error on last attempt: Error: getaddrinfo ENOTFOUND build-artifactory.eng
[   ...............] / cloneCurrentTree: WARN retry will retry, error on last attempt: Error: getaddrinfo ENOTFOUND build-artifactory.eng
[   ...............] / cloneCurrentTree: WARN retry will retry, error on last attempt: Error: getaddrinfo ENOTFOUND build-artifactory.eng
[   ...............] / cloneCurrentTree: WARN retry will retry, error on last attempt: Error: getaddrinfo ENOTFOUND build-artifactory.eng
[   ...............] / cloneCurrentTree: WARN retry will retry, error on last attempt: Error: getaddrinfo ENOTFOUND build-artifactory.eng
[   ...............] - cloneCurrentTree: WARN retry will retry, error on last attempt: Error: getaddrinfo ENOTFOUND build-artifactory.eng
[   ...............] - cloneCurrentTree: WARN retry will retry, error on last attempt: Error: getaddrinfo ENOTFOUND build-artifactory.eng
[   ...............] - cloneCurrentTree: WARN retry will retry, error on last attempt: Error: getaddrinfo ENOTFOUND build-artifactory.eng
[   ...............] - cloneCurrentTree: WARN retry will retry, error on last attempt: Error: getaddrinfo ENOTFOUND build-artifactory.eng
[   ...............] | cloneCurrentTree: WARN retry will retry, error on last attempt: Error: getaddrinfo ENOTFOUND build-artifactory.eng
npm ERR! fetch failed https://build-artifactory.eng.vmware.com/artifactory/api/npm/npm/adm-zip/-/adm-zip-0.4.7.tgz
npm WARN retry will retry, error on last attempt: Error: getaddrinfo ENOTFOUND build-artifactory.eng.vmware.com build-artifactory.en
g.vmware.com:443
npm ERR! fetch failed https://build-artifactory.eng.vmware.com/artifactory/api/npm/npm/acorn/-/acorn-4.0.11.tgz
...
...
*snip*