Github user tae-jun commented on the issue:
https://github.com/apache/zeppelin/pull/1567
I guess it's same CI error with #1518.
There is a log which is:
```bash
gzip: stdin: unexpected end of file
tar: Unexpected EOF in archive
tar: Unexpected EOF in archive
tar: Error is not recoverable: exiting now
+echo 'Unable to extract spark-1.3.1-bin-hadoop2.3.tgz'
Unable to extract spark-1.3.1-bin-hadoop2.3.tgz
```
This is because of cache failure of Travis CI, and if it happens, it goes
forever. Because caching is done only at the first time.
Because of this, if you follow the log more, you can see:
```bash
SPARK HOME detected null
```
Therefore, Zeppelin cannot find Spark, and it goes to failure.
I think it will pass if you run Travis CI on your own repository.
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