title: bundle is throwing an error while installing dradis community edition
body: <p>I am trying to install dradis community edition for Kali linux through this website:</p>
  
  <p><a href="https://dradisframework.com/ce/documentation/install_kali.html" rel="nofollow noreferrer">https://dradisframework.com/ce/documentation/install_kali.html</a></p>
  
  <p>and </p>
  
  <p><a href="https://dradisframework.com/ce/documentation/install_git.html" rel="nofollow noreferrer">https://dradisframework.com/ce/documentation/install_git.html</a></p>
  
  <p>when I run the command:</p>
  
  <pre><code>./bin/setup
  </code></pre>
  
  <p>I am getting the following error:</p>
  
  <pre><code>== Enabling default add-ons ==
  == Installing dependencies ==
  Traceback (most recent call last):
      1: from /usr/local/bin/bundle:23:in `&lt;main&gt;'
  /usr/local/bin/bundle:23:in `load': cannot load such file -- /usr/share/rubygems-integration/all/gems/bundler-1.17.3/exe/bundle (LoadError)
  Traceback (most recent call last):
      1: from /usr/local/bin/bundle:23:in `&lt;main&gt;'
  /usr/local/bin/bundle:23:in `load': cannot load such file -- /usr/share/rubygems-integration/all/gems/bundler-1.17.3/exe/bundle (LoadError)
  
  == Command ["bundle install"] failed ==
  </code></pre>
  
  <p>This is happening on all bundle commands like</p>
  
  <pre><code>bundle -v
  
  bundle install
  </code></pre>
  
  <p>What could be causing this? I am new to this.</p>
  
  <p>Update 1:</p>
  
  <p>I tried <code>gem update --system</code> and tried the <code>./bin/setup</code> again. It gives me the following error:</p>
  
  <pre><code>Fetching nokogumbo 2.0.1
  Installing nokogumbo 2.0.1 with native extensions
  Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
  
      current directory: /root/dradis-ce/gems/nokogumbo-2.0.1/ext/nokogumbo
  /usr/bin/ruby2.5 -I /usr/local/lib/site_ruby/2.5.0 -r ./siteconf20190224-6660-1caz3w7.rb extconf.rb
  *** extconf.rb failed ***
  Could not create Makefile due to some reason, probably lack of necessary
  libraries and/or headers.  Check the mkmf.log file for more details.  You may
  need configuration options.
  
  Provided configuration options:
      --with-opt-dir
      --without-opt-dir
      --with-opt-include
      --without-opt-include=${opt-dir}/include
      --with-opt-lib
      --without-opt-lib=${opt-dir}/lib
      --with-make-prog
      --without-make-prog
      --srcdir=.
      --curdir
      --ruby=/usr/bin/$(RUBY_BASE_NAME)2.5
  /usr/local/lib/site_ruby/2.5.0/rubygems/dependency.rb:313:in `to_specs': Could not find 'nokogiri' (= 1.8.4) - did find: [nokogiri-1.8.5]
  (Gem::MissingSpecVersionError)
  Checked in 'GEM_PATH=/root/dradis-ce', execute `gem env` for more information
      from /usr/local/lib/site_ruby/2.5.0/rubygems/dependency.rb:323:in `to_spec'
      from /usr/local/lib/site_ruby/2.5.0/rubygems/specification.rb:1033:in `find_by_name'
      from extconf.rb:9:in `&lt;main&gt;'
  
  extconf failed, exit code 1
  
  Gem files will remain installed in /root/dradis-ce/gems/nokogumbo-2.0.1 for inspection.
  Results logged to /root/dradis-ce/extensions/x86_64-linux/2.5.0/nokogumbo-2.0.1/gem_make.out
  
  An error occurred while installing nokogumbo (2.0.1), and Bundler cannot continue.
  Make sure that `gem install nokogumbo -v '2.0.1' --source 'https://rubygems.org/'` succeeds before bundling.
  
  In Gemfile:
    sanitize was resolved to 5.0.0, which depends on
      nokogumbo
  
  == Command ["bundle install"] failed ==
  </code></pre>