Github user DrIgor commented on the issue:
https://github.com/apache/zeppelin/pull/1769
@Leemoonsoo Thank you for reply!
I forgot about tests, it's my fault.
Tests didn't pass `zeppelin.dep.localrepo` property to interpreter. That's
why DependecyResolver got `null`. Old implementation used string "null" as
folder name =)
I think it's better not to pass null as repo path. I fixed tests to pass
temporary folder as repo path
Now apt-get is failing, I promise it wasn't me :-)
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