This is a fix for Vagrant, an annoying one for me at least, some people may not have it.
I'll run
vagrant up ubuntu/trusty64 --provider virtualbox
The error I'll get is
The machine with the name 'ubuntu/trusty64' was not found configured for this Vagrant environment.
The fix:
vagrant box add ubuntu/trusty64 rm Vagrantfile vagrant init ubuntu/trusty64 vagrant up