Allow Oracle Certificate through System PreferencesĪs it turns out, the first way you can resolve this problem is through the System Preferences menu on your machine. With that said, without further ado, let us show you can do this in more detail so just follow through. In addition to that, you can also use the terminal on your system and execute a few commands that will load the kernel extensions and allow it to be run on the system. First, of all, you can allow the certificate through the System and Privacy settings located in the System Preferences menu. This has to be done explicitly by giving VirtualBox the required permissions. To resolve this, you will have to allow the Oracle certificate by adding it to the authorization list. In addition to this, the kernel extensions for VirtualBox are disabled by macOS as well during the installation process which is why you are facing the error message in question here. The error message is caused because the Oracle certificate is blocked by your operating system i.e. Kernel Driver Not Installed (rc=-1908) Error Message on MacĪs it turns out, the problem is pretty similar to the VirtualBox installation failed error that appears when you are trying to install VirtualBox on your machine.

The error message here does not matter on the operating system that you are trying to install on the virtual machine but rather the problem in question appears when you install Oracle products like VirtualBox for the first time on your Mac.

When you install VirtualBox on your macOS and try to use it by installing a virtual machine, it is very likely that you get the “ Kernel driver not installed (rc=-1908)” error message. Oracle VM VirtualBox is one of the most notorious and free virtual machine hypervisors that is available for macOS along with other paid applications like VMware or Parallel.

Uninstall virtualbox mac terminal