I installed Chef DK on a VM running Ubuntu 12.04 and got the following error message when I ran "chef verify":
:~# chef verify
Running verification for component 'berkshelf'
Running verification for component 'test-kitchen'
Running verification for component 'chef-client'
Running verification for component 'chef-dk'
Running verification for component 'chefspec'
Running verification for component 'rubocop'
Running verification for component 'fauxhai'
Running verification for component 'knife-spork'
Running verification for component 'kitchen-vagrant'
Running verification for component 'package installation'
..........
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/specification.rb:2104:in `raise_if_conflicts': Unable to activate knife-container-0.2.4, because json-1.8.2 conflicts with json (<= 1.8.1, >= 1.4.4) (Gem::ConflictError)
Hope you can help me out. Thanks!