Github user OopsOutOfMemory commented on the issue:
https://github.com/apache/zeppelin/pull/1891
It seems CI has a network issue
```
[ERROR] Error requesting archive.
[ERROR] Status: 503
[ERROR] Request options: {
[ERROR] "uri":
"https://github.com/Medium/phantomjs/releases/download/v2.1.1/phantomjs-2.1.1-linux-x86_64.tar.bz2";,
[ERROR] "encoding": null,
[ERROR] "followRedirect": true,
[ERROR] "headers": {
[ERROR] "User-Agent": "yarn/0.18.1 npm/? node/v6.9.1 linux x64"
[ERROR] },
[ERROR] "strictSSL": true
[ERROR] }
[ERROR] Response headers: {
[ERROR] "cache-control": "no-cache",
[ERROR] "connection": "close",
[ERROR] "content-type": "text/html"
[ERROR] }
[ERROR] Make sure your network and proxy settings are correct.
```
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