Build failed in Jenkins: streams-project-site #48

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See <https://builds.apache.org/job/streams-project-site/48/>

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Started by upstream project "streams-project" build number 272
originally caused by:
 Started by upstream project "streams-master" build number 82
 originally caused by:
  Started by user sblackmon
[EnvInject] - Loading node environment variables.
Building remotely on ubuntu-6 (Ubuntu yahoo-not-h2 ubuntu docker) in workspace <https://builds.apache.org/job/streams-project-site/ws/>
Wiping out workspace first.
Cloning the remote Git repository
Cloning repository https://git-wip-us.apache.org/repos/asf/incubator-streams.git
 > git init <https://builds.apache.org/job/streams-project-site/ws/> # timeout=10
Fetching upstream changes from https://git-wip-us.apache.org/repos/asf/incubator-streams.git
 > git --version # timeout=10
 > git -c core.askpass=true fetch --tags --progress https://git-wip-us.apache.org/repos/asf/incubator-streams.git +refs/heads/*:refs/remotes/origin/*
 > git config remote.origin.url https://git-wip-us.apache.org/repos/asf/incubator-streams.git # timeout=10
 > git config --add remote.origin.fetch +refs/heads/*:refs/remotes/origin/* # timeout=10
 > git config remote.origin.url https://git-wip-us.apache.org/repos/asf/incubator-streams.git # timeout=10
Cleaning workspace
 > git rev-parse --verify HEAD # timeout=10
No valid HEAD. Skipping the resetting
 > git clean -fdx # timeout=10
Fetching upstream changes from https://git-wip-us.apache.org/repos/asf/incubator-streams.git
 > git -c core.askpass=true fetch --tags --progress https://git-wip-us.apache.org/repos/asf/incubator-streams.git +refs/heads/*:refs/remotes/origin/*
 > git rev-parse origin/master^{commit} # timeout=10
Checking out Revision f0072b4c60a40109e3567c3aa07f65ee47be8d81 (origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f f0072b4c60a40109e3567c3aa07f65ee47be8d81
 > git rev-list f0072b4c60a40109e3567c3aa07f65ee47be8d81 # timeout=10
[streams-project-site] $ /bin/bash -xe /tmp/hudson784786136398709077.sh
+ sudo apt-get install graphviz
sudo: PAM authentication error: User not known to the underlying authentication module
Build step 'Execute shell' marked build as failure

Jenkins build is back to normal : streams-project-site #49

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See <https://builds.apache.org/job/streams-project-site/49/changes>