[Vagrant]The box 'dummy' could not be found.
$ vagrant up
Bringing machine 'default' up with 'virtualbox' provider...
There are errors in the configuration of this machine. Please fix
the following errors and try again:
vm:
* The box 'dummy' could not be found.
解決方法
起動オプション --provider=aws をつけましょう。$ vagrant up --provider=aws