As 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 is caused because the Oracle certificate is blocked by your operating system i.e. macOS. 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. To resolve this, you will have to allow the Oracle certificate by adding it to the authorization list. This has to be done explicitly by giving VirtualBox the required permissions. You can do this in multiple ways. First, of all, you can allow the certificate through the System and Privacy settings located in the System Preferences menu. 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. With that said, without further ado, let us show you can do this in more detail so just follow through.
Allow Oracle Certificate through System Preferences
As it turns out, the first way you can resolve this problem is through the System Preferences menu on your machine. When macOS blocks software from loading kernel extensions or anything else, you will be shown a message in the System and Privacy settings. However, this message is only there for 30 minutes and if you have been facing the error message for a while, you will have to uninstall VirtualBox from your system. Once you have uninstalled VirtualBox, move the App to the trash folder and also delete any remaining files. After doing that, you can go ahead and download the installer again to install VirtualBox on your system. Once you have installed VirtualBox, you will have to quickly follow the instructions given down below within the first 30 minutes or it will disappear again and you will have to start over again. With that said, follow the instructions given down below to allow Oracle through the System Preferences menu:
Allow VirtualBox Kernel Extensions through the Terminal
For the more tech-savvy and hardcore users out there, there is also another way you can resolve the issue which requires you to enter a command to the Terminal prompt. This will do the same thing that we were doing above, just through the Terminal window. In addition, if you choose to follow this method, it won’t require you to reinstall VirtualBox as it did in the method mentioned above as we will be using the Terminal here. However, to do this, we will have to boot into the Recovery Mode in order to do this. Recovery mode lets you restore Mac to a previous date as well as allowing you to reinstall macOS along with many more other things. Follow the instructions given down below to do this:
Disable Secure Boot on your Mac
If the above methods do not work out for you, in some cases, the issue can also be related to the Secure Boot on your BIOS. Secure Boot is basically a security feature of UEFI, also known as Unified Extensible Firmware Interface. When you have Secure Boot enabled and configured, it can help your computer resist malware attacks and infections. As it turns out, since it is a security feature, it can also cause issues with some applications on your device which could be the case here. Therefore, you will have to disable it on your machine and see if that works out. To do this, follow the instructions given down below: In case you are not able to disable Secure Boot from Recovery mode, then in such a case, you will have to get into your BIOS settings and change it from there.
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