http://www.thegeeky.space/2014/05/how-to-install-metasploit-framework-from-github-on-ubuntu.html
上記のサイトを利用してwindows10 の bash on ubuntu on windowsにmetasploitをインストールしようとしたのですが、上記サイトの5) Install gems and version required by metasploit.
After finish downloading, go to metasploit folder
の bandle installを実行したときに下記のエラーが出てインストールできませんでした。解決策がありましたら、よろしくお願いします。
--- ERROR REPORT TEMPLATE -------------------------------------------------------
- What did you do?

  I ran the command `/usr/local/bin/bundle install`

- What did you expect to happen?

  I expected Bundler to...

- What happened instead?

  Instead, what actually happened was...


Error details

    ArgumentError: parent directory is world writable, FileUtils#remove_entry_secure does not work; abort: "/root/.bundle/cache/compact_index/rubygems.org.443.29b0360b937aa4d161703e6160654e47/versions20160824-16619-c4w9ab" (parent directory mode 40777)
      /usr/lib/ruby/1.9.1/fileutils.rb:708:in `remove_entry_secure'
      /usr/lib/ruby/1.9.1/tmpdir.rb:85:in `ensure in mktmpdir'
      /usr/lib/ruby/1.9.1/tmpdir.rb:85:in `mktmpdir'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/vendor/compact_index_client/lib/compact_index_client/updater.rb:29:in `update'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/vendor/compact_index_client/lib/compact_index_client.rb:64:in `update'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/vendor/compact_index_client/lib/compact_index_client.rb:55:in `update_and_parse_checksums!'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/fetcher/compact_index.rb:65:in `available?'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/fetcher/compact_index.rb:15:in `call'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/fetcher/compact_index.rb:15:in `block in compact_index_request'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/fetcher.rb:154:in `use_api'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/source/rubygems.rb:331:in `block in api_fetchers'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/source/rubygems.rb:331:in `select'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/source/rubygems.rb:331:in `api_fetchers'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/source/rubygems.rb:336:in `block in remote_specs'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/index.rb:10:in `build'      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/source/rubygems.rb:335:in `remote_specs'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/source/rubygems.rb:82:in `specs'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/definition.rb:211:in `block (2 levels) in index'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/definition.rb:209:in `each'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/definition.rb:209:in `block in index'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/index.rb:10:in `build'      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/definition.rb:206:in `index'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/definition.rb:200:in `resolve'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/definition.rb:140:in `specs'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/definition.rb:129:in `resolve_remotely!'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/installer.rb:195:in `resolve_if_need'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/installer.rb:70:in `run'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/installer.rb:22:in `install'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/cli/install.rb:102:in `run'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/cli.rb:175:in `install'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/vendor/thor/lib/thor.rb:359:in `dispatch'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/vendor/thor/lib/thor/base.rb:440:in `start'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/cli.rb:11:in `start'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/exe/bundle:27:in `block in <top (required)>'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/lib/bundler/friendly_errors.rb:98:in `with_friendly_errors'
      /var/lib/gems/1.9.1/gems/bundler-1.12.5/exe/bundle:19:in `<top (required)>'
      /usr/local/bin/bundle:23:in `load'
      /usr/local/bin/bundle:23:in `<main>'

Environment

  Bundler   1.12.5
  Rubygems  1.8.23
  Ruby      1.9.3p484 (2013-11-22 revision 43786) [x86_64-linux]
  GEM_HOME  /var/lib/gems/1.9.1
  GEM_PATH  /var/lib/gems/1.9.1:/root/.gem/ruby/1.9.1
  Git       1.9.1

      Bundler settings

  orig_path
    Set via BUNDLE_ORIG_PATH: "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
--- TEMPLATE END ----------------------------------------------------------------

Unfortunately, an unexpected error occurred, and Bundler cannot continue.