Logstash start Gem::LoadError:

New to ELK here. I am following install instructions for Logstash on Ubuntu 16.04. Elasticsearch and Kibana are already installed and function properly. When I run DEBUG=1 bin/logstash -e ‘input { stdin { } } output { stdout {} }’ from /usr/share/logstash I get the following error:

DEBUG: exec /usr/share/logstash/vendor/jruby/bin/jruby /usr/share/logstash/lib/bootstrap/environment.rb logstash/runner.rb -e input { stdin { } } output { stdout {} }
Gem::LoadError: You have already activated jar-dependencies 0.3.12, but your Gemfile requires jar-dependencies 0.3.11. Prepending `bundle exec` to your command may solve this.
  block in setup at /usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/bundler-1.9.10/lib/bundler/runtime.rb:34
            each at org/jruby/RubyArray.java:1734
            each at /usr/share/logstash/vendor/jruby/lib/ruby/stdlib/forwardable.rb:189
           setup at /usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/bundler-1.9.10/lib/bundler/runtime.rb:19
           setup at /usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/bundler-1.9.10/lib/bundler.rb:122
          setup! at /usr/share/logstash/lib/bootstrap/bundler.rb:57
          <main> at /usr/share/logstash/lib/bootstrap/environment.rb:63

It seems there are dependency issues here? I installed logstash from the repositories, version 6.1.1-1. I googled around and couldn’t find much to answer my question to why this doesn’t work.

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