[JENKINS] Solr-reference-guide-8.x - Build # 8224 - Failure

[Apache Jenkins Server <je...@builds.apache.org>]

Build: https://builds.apache.org/job/Solr-reference-guide-8.x/8224/

Log: 
Started by timer
Running as SYSTEM
[EnvInject] - Loading node environment variables.
Building remotely on websites (git-websites svn-websites) in workspace /home/jenkins/jenkins-slave/workspace/Solr-reference-guide-8.x
No credentials specified
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://gitbox.apache.org/repos/asf/lucene-solr.git # timeout=10
Cleaning workspace
 > git rev-parse --verify HEAD # timeout=10
Resetting working tree
 > git reset --hard # timeout=10
 > git clean -fdx # timeout=10
Fetching upstream changes from https://gitbox.apache.org/repos/asf/lucene-solr.git
 > git --version # timeout=10
 > git fetch --tags --progress -- https://gitbox.apache.org/repos/asf/lucene-solr.git +refs/heads/*:refs/remotes/origin/*
 > git rev-parse refs/remotes/origin/branch_8x^{commit} # timeout=10
 > git rev-parse refs/remotes/origin/origin/branch_8x^{commit} # timeout=10
Checking out Revision 361bf78d899433730210bcec1b775b74cbb71664 (refs/remotes/origin/branch_8x)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 361bf78d899433730210bcec1b775b74cbb71664
Commit message: "LUCENE-9102: update changes.txt"
 > git rev-list --no-walk baeaa56fb27efe41b9c41d35a93d086b2a9d7cb4 # timeout=10
No emails were triggered.
[Solr-reference-guide-8.x] $ /bin/bash -xe /tmp/jenkins14769360344944146092.sh
+ gpg2 --keyserver hkp://pool.sks-keyservers.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
/tmp/jenkins14769360344944146092.sh: line 4: gpg2: command not found
+ command curl -sSL https://rvm.io/mpapis.asc
+ curl -sSL https://rvm.io/mpapis.asc
+ gpg --import -
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0
Build step 'Execute shell' marked build as failure
Publishing Javadoc
Email was triggered for: Failure - Any
Sending email for trigger: Failure - Any