berks fail in a clean installation on ubuntu 15.10

[ravn]

It appears that the source for Berksfile is not valid anymore?

[dnapier]

I'm also having this issue.

/usr/lib/ruby/vendor_ruby/bundler/resolver.rb:354:in `block in verify_gemfile_dependencies_are_found!': Could not find gem 'vagrant-berkshelf' in any of the gem sources listed in your Gemfile or available on this machine. (Bundler::GemNotFound)
        from /usr/lib/ruby/vendor_ruby/bundler/resolver.rb:330:in `each'
        from /usr/lib/ruby/vendor_ruby/bundler/resolver.rb:330:in `verify_gemfile_dependencies_are_found!'
        from /usr/lib/ruby/vendor_ruby/bundler/resolver.rb:199:in `start'
        from /usr/lib/ruby/vendor_ruby/bundler/resolver.rb:183:in `resolve'
        from /usr/lib/ruby/vendor_ruby/bundler/definition.rb:198:in `resolve'
        from /usr/lib/ruby/vendor_ruby/bundler/definition.rb:137:in `specs'
        from /usr/lib/ruby/vendor_ruby/bundler/definition.rb:182:in `specs_for'
        from /usr/lib/ruby/vendor_ruby/vagrant.rb:76:in `<top (required)>'
        from /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'