Github user zjffdu commented on the issue:
https://github.com/apache/zeppelin/pull/2504
This is because travis use 'precise' by default before, so at that time it
is OK when we don't specify dist. But now travis is upgrading ubuntu from
`precise` to `trusty`, `trusty` will become default in the near future. That's
why I specify `precise` explicitly in this PR.
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