When trying to run the Cumulus vagrant image it fails with the error
Failed to load the "vagrant-cumulus" plugin. View logs for more details.This is seen even if the plugin is install
$vagrant plugin list
vagrant-cumulus (0.1)If you see this be sure you are running vagrant version 1.7 or later. Only 1.7+ supports the vagrant-cumulus plugin.
Some apt-get installs of vagrant will install version 1.4 and provide this less than helpful error message.