VBoxManage: error: Unknown option: --clipboard

[basictheprogram]

Using the an unchanged Vagrantfile vagrant/virtualbox throws an error

$ vagrant up --provider  virtualbox
<snip>
["modifyvm", :id, "--clipboard", "bidirectional"]

The following error was experienced:

#<Vagrant::Errors::VBoxManageError: There was an error while executing `VBoxManage`, a CLI used by Vagrant
for controlling VirtualBox. The command and stderr is shown below.

Command: ["modifyvm", "c553546c-59f4-4524-957e-05ef4a7bda54", "--clipboard", "bidirectional"]

$ vagrant --version
Vagrant 2.2.6

$ VBoxManage --version
6.1.0r135406

Maybe this is the problem?
https://forums.virtualbox.org/viewtopic.php?f=6&t=95992

What's odd, if I REMOVE this line

v.customize ["modifyvm", :id, "--clipboard", "bidirectional"]

from the Vagrantfile I still get the error

[GuyWhoKnowsTheGuy]

It seems like the flag --clipboard got renamed to --clipboard-mode in 6.1.

More details: hashicorp/vagrant#11288

[KerbenII]

You can find more details about this issue here:
ruzickap/packer-templates#54 (comment)

[mgmax]

It seems that VirtualBox 7 has added a compatibility fallback, so the issue is gone:
vboxmanage modifyvm $ID --clipboard bidirectional works correctly.

$ vboxmanage --version
7.0.12r159484

We could just raise the minimum version in the README file. Sooner or later, VirtualBox 6.1 will reach its end of life anyway.