Gridsync's Vagrant-related configuration has become stale in various ways:

• Due to Vagrant's added support for "multi-machine" configurations, the old vagrantfiles directory is no longer necessary and can be deleted in favor of using the single Vagrantfile already found at the top-level of the project
• The top-level Vagrantfile contains configuration to spin up environments that are no longer supported (e.g., macOS 10.13)
• The top-level Vagrantfile lacks configuration for newer environments that should be supported (e.g., Ubuntu 20.10)
• Some versions of Vagrant/VirtualBox will throw an VERR_CFGM_VALUE_NOT_FOUND error when attempting to spin up multiple environments from the configuration file due to what appears to be improper nesting within the top-level Vagrantfile.

Because Vagrant/VirtualBox is used for smoke testing Gridsync binaries across different platforms, the above issues should be resolved before the next release.