Hi, as per documentation on page
https://www.vagrantup.com/docs/virtualbox/configuration.html there is a Note saying:
the generated master VMs are currently not removed automatically by Vagrant. This has to be done manually. However, a master VM can only be removed when there are no linked clones connected to it.
Now how am I supposed to know, which generated master VMs can be removed? I have three master VMs and 7 linked clones. I found no way to find out which machine is linked to which master and thus I found no way how to find out which masters are not used anymore, to be deleted.
Anyway, Vagrant should definitely ask if I want to delete master VM, when destroying a machine that is the last clone of it.