VBoxManage: error: Details: code VBOX_E_INVALID_OBJECT_STATE (0x80bb0007), component MachineWrap, interface IMachine, callee nsISupports

This issue was originally opened by @Neudrino in https://github.com/hashicorp/packer/issues/12008 and has been migrated to this repository. The original issue description is below.

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Overview of the Issue

Packer won't build a Virtualbox VM on an ISO image. Error is

==> virtualbox-iso: Error starting VM: retry count exhausted. Last err: VBoxManage error: VBoxManage: error: The machine 'packer-virtualbox-iso-1663686568' is already locked by a session (or being locked or unlocked)
==> virtualbox-iso: VBoxManage: error: Details: code VBOX_E_INVALID_OBJECT_STATE (0x80bb0007), component MachineWrap, interface IMachine, callee nsISupports
==> virtualbox-iso: VBoxManage: error: Context: "LaunchVMProcess(a->session, sessionType.raw(), ComSafeArrayAsInParam(aBstrEnv), progress.asOutParam())" at line 727 of file VBoxManageMisc.cpp