Github user tinkoff-dwh commented on the issue:
https://github.com/apache/zeppelin/pull/2495
@felixcheung
fixed
CI RED because
W: GPG error: http://cran.rstudio.com/bin/linux/ubuntu precise/ Release:
The following signatures were invalid: BADSIG 51716619E084DAB9 Michael Rutter
<marut...@gmail.com>
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