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Posted : admin On 8/22/2021

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This document will provide instructions on getting a macOS Catalina install working with Guest Additions on VirtaulBox 6.1.

Start by downloading a copy of the installer from the App Store. You will need a computer running macOS and you will need to convert the installer to an ISO. I will not be covering these steps here, but there are plenty tutorials online.

Installing VirtualBox

I’m hoping you already have this part covered and you are coming here only because you had issues getting macOS installed, but just in case, make sure the following packages are installed (Arch):

Creating the VM

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Start by creating a new VM. Give it a name without spaces.

Give it enough memory so the install will run faster. We can change this later.

Select to create a new Virtual Hard Disk

Select VDI

Select fixed size

Give it a bare minimum of 25GB (I would advise on at least 50GB if you can spare the space)

Edit the machine, go into «System => Motherboard» and disable floppy boot and change the chipset to PIIX3

In the processor give more CPU if you can spare

In «Display => Screen» increase the video memory to 128MB and enable 3D acceleration

Enable USB 3.0

Note: if you can’t see USB 3.0 you might need to add your user to the vboxusers group

Insert the install ISO

Additional Configuration

Now we need to run a few vboxmanage commands for additional settings. Either run the lines with vboxmanage from the script below (add your virtual machine name under $vm_name), or save the full script and run it.

Note: the default resolution is set to «1280x1024». You can change it in the last line of the update code. Make sure to keep it to “640x480, 800x600, 1280x1024, 1440x900, 1900x1200“

Installing macOS

We are now ready for the install. Start the machine and select you language.

Select disk utility.

Select the VirtualBox hard disk and click on erase.

Give it a name, select the same options and click on erase. Close the disk utility when done.

Click on install macOS.

Continue with the install as you would until you are presented with the desktop.

Note that the installer will reboot once in the middle of the install.

Installing Guest Additions

We now need to get Guest Additions installed. Remove the install ISO and mount the guest additions CD. Open it with finder and run the VBoxDarwinAdditions.pkg

Install it as if you would install any other package.

You will most likely get an error message that the install has failed.

Close everything, unmount the guest additions CD and open a terminal window (Command+Space, type terminal).

Now we need to restart the VM in recovery mode. Type in:

Once it has rebooted into recovery mode, on the top click on «Utilities => Termminal»

Type in the code below. This is to sign Oracle software as authorized. Then we disable recovery mode and restart the VM.

When the VM has rebooted you should have guest additions working. Remember that not everything works, but the features below should:

  • Copy/Paste
  • Drag and Drop
  • VirtualBox Shared Folders
  • Guest Control

Virtual Machines ( VM ) are great. They allow you to emulate additional operating systems, each in their own individual window, on a computer. For example, your can run a Linux instance in a VM on your Mac or Windows PC.

Many people have, at least, heard of VMWare and/or Parallels. But today we’re going to focus on a free, open-source and cross platform alternative. VirtualBox.


Vbox Guest Additions Iso Downloadwesternthis

macOS and Windows users can download and install VirtualBox from the downloads page of the official website. Once VirtualBox is downloaded, proceede with the installation as normal.

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Linux users should be able to find VirtualBox in the default repos however, depending on the distro you’re using, the package can be an outdated one. Unless you’re an Arch ( or derivates ) user, please refer to this page on how to install VirtualBox on your system.


The VirtualBox Extension Pack adds support for USB 2.0 and USB 3.0 devices, VirtualBox RDP, disk encryption, NVMe and PXE boot for Intel cards. It can be downloaded from the same downloads page ( linked above ).

Once VirtualBox is installed on your machine, download the extension pack. IF you can’t open the extension pack directly with virtualbox to install it, then you should open VirtualBox go to Preferences > Extensions and to add it.

Also, while in Preferencesgo to General and modify ( if you want ) the default folder location of where your VMs will be installed.


When you first open VirtualBox you will get a screen similar to the one seen in the screenshot below. Obviously, you won’t have any virtual machines created. So let’s create one.

1. Download the operating system that you want to install in a VM ( virtual machine ). I’ll use Pop!_OS

2. Click on New to start creating your VM.

3. Name your VM. Usually VirtualBox will autodetect the type and version of your OS. IF you’re using a major distribution. For example Windows, or Debian, Ubuntu, Fedora or Arch.

Since Pop!_OS is a derivate of Ubuntu, VirtualBox can’t autodetect it, and you’ll need to manually select the type of OS ( Linux in this case ) and version ( Ubuntu 64-bit in this case ).

4. On the next screen set the amount of RAM you want to allocate to your VM. Usually 4GB ( 4096 MB ) should be enough. But if you can spare it allocate 8GB (8192 MB ).

5. Now it’s time to create the virtual disk where VirtualBox will store the data. VirtualBox can create two types of virtual disks. Dynamic and fixed.

The dynamically allocated virtual disk will only take space on your actual drive as it’s getting filled. For example, let’s say you create a 100GB virtual drive. But the VM only takes 10GB, the dynamically allocated disk will only take 10GB of your actual drive space. And it will take more and more space as the virtual drive gets filled.

The fixedvirtual disk is self explanatory. You create a 100GB fixed virtual disk, it will take 100GB of your actual drive space.


1. Once you’ve created your VM, you’ll have the virtual drive with a basic configuration which you can see a summary of on the main screen.

2. To configure your VM you have two options. You can either click on each section to quickly modify the parameters …

… or select your VM and click on Settings

3. Now you can configure your VM. I won’t go through every single options. I’ll just show you the most important ones that will get you up and running.

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NOTE: this configuration is for only ONE VM. If you want to run more VMs at the same time, you should allocate RAM and CPUs accordingly.

General – Enable disk encryption if needed.

System > Motherboard – Enable EFI if needed

System > Processor – Add more CPUs.

Display > Screen – Max out Video Memory, choose your graphics controller and optionally enable 3D acceleration.

Storage – Select the empty optical drive and add your downloaded .iso


Now that you’ve created and configured your VM, it’s time to start it. To do that you can either double click on your VM or select it and click on Start

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Your VM will start and you can install the OS of your choice.


Once the OS has been installed on your VM, you will probably ( at least ) notice that the screen resolution is not the correct one and you might not even be able to scale the window.

To fix this issue and add more functionality to your VM, you will need to install Guest Additions.

VirtualBox Guest Adttitions are a set of device drivers and system applications that optimize the guest operating system for better performance and usability.

If you installed Windows, installing Guest Additions is easy. While running your Windows VM, go to the manu of your virtual machine, choose Devices and then choose Insert Guest Additions CD image...

VirtualBox will mount the Guest Additions ISO file inside your virtual machine. A Windows guest should then automatically start the Guest Additions installer, which installs the Guest Additions on your Windows guest.

The VirtualBox Guest Additions for Linux are provided on the same virtual CD-ROM file as the Guest Additions for Windows. They also come with an installation program that guides you through the setup process. However, due to the significant differences between Linux distributions, installation may be slightly more complex when compared to Windows.

So let’s fix this for Pop!_OS/Ubuntu. Open up the terminal and run sudo apt install virtualbox-guest-dkms virtualbox-guest-x11 -y.

Reboot your VM and you will notice that Auto-resize Guest Display ( enable/disable from View menu found in the menu bar ) , drag-and-drop between host and VM and shared clipboard between host and VM ( enable/disable from Devices menu in the menu bar ) all work.

Also, you can now mount the Guest Additions image and install it. Open up the terminal and cd into path cd /media/USER/VBox_GAs_6.1.16. Now install VirtualBox Guest Additions with sudo ./VBoxLinuxAdditions.run. When prompted type yes.

Vbox Guest Additions Iso Download

For more info on how to install Guest Additions on Linux, check out this page.