Circle CI output failing for sous-chef orb 2.1.1

circle-ci-output.txt

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100 23409  100 23409    0     0  66288      0 --:--:-- --:--:-- --:--:-- 66314
ubuntu 16.04 x86_64
Getting information for chefdk current  for ubuntu...
downloading https://omnitruck.chef.io/current/chefdk/metadata?v=&p=ubuntu&pv=16.04&m=x86_64
  to file /tmp/install.sh.5059/metadata.txt
trying wget...
ERROR 404
Omnitruck artifact does not exist for version  on platform ubuntu

Either this means:
   - We do not support ubuntu
   - We do not have an artifact for 

This is often the latter case due to running a prerelease or RC version of Chef
or a gem version which was only pushed to rubygems and not omnitruck.

You may be able to set your knife[:bootstrap_version] to the most recent stable
release of Chef to fix this problem (or the most recent stable major version number).

In order to test the version parameter, adventurous users may take the Metadata URL
below and modify the '&v=<number>' parameter until you successfully get a URL that
does not 404 (e.g. via curl or wget).  You should be able to use '&v=11' or '&v=12'
successfully.

If you cannot fix this problem by setting the bootstrap_version, it probably means
that ubuntu is not supported.

Metadata URL: https://omnitruck.chef.io/current/chefdk/metadata?v=&p=ubuntu&pv=16.04&m=x86_64

Exited with code exit status 1