Now, go to Devices > Install Guest Additions and follow the given instructions.sudo chmod 775 /System/Library/Extensions/.sudo chown :admin /System/Library/Extensions/.On the Normal boot mode, open the Terminal again and enter these commands to give permissions to modify some system files:.On the Recovery mode, run the Terminal and enter the commands below to disable System Integrity Protection (SIP):.
Open the Terminal and enter the following command to boot in recovery mode. However, keep in mind that some versions of Mac may need different commands. If it fails, follow the instructions below. Similar to Windows, first try selecting Devices > Install Guest Additions and following the instructions on a Mac VM. Open the Terminal and enter the commands below to install Linux Guest Additions:. Click on VBoxGuestAdditions.iso and select Open. Navigate to C:\Program Files\Oracle\VirtualBox. After the reboot, go to Devices > Optical Disks > Choose a disk file. Enter the following commands to install build essentials on the system:. Here, you can mount the Guest Additions ISO file and use the Terminal to install guest additions. However, you may get the E_FAIL (0x80004005) error in some cases. Run VBoxWindowsAdditions.exe and follow the on-screen instructions.Ī similar method works on most Linux OS. Open the File Explorer and go to the mounted CD drive. From the menu, select Devices > Install Guest Additions. Installing Guest Additions is very easy on a Windows Virtual Machine and you shouldn’t encounter any issues. You can only access the option you need to enable true full-screen if this package is present. The first thing you should do is install Guest Additions on the VM. Here’s a step-by-step explanation of these processes. 
If you want this display to fill up the entire screen, you need to execute additional tasks. The Window goes to full-screen mode but the display remains the same and occupies the central position. While the above option is called Full Screen Mode, it doesn’t actually change the size of the Virtual Machine display. How to Make VirtualBox Actually Full Screen
If you want to change this key or the shortcut, you need to go to File > Preferences > Input > Virtual Machine. The Host key is the Right Ctrl by default and you can see the current host key on the bottom-right of the VM window. You can also use the Host Key + F shortcut to enable/disable this mode. However, if you want to open the VM without its menu or the Taskbar, you need to select Full-screen Mode. The Maximize button on the Virtual Machine’s window extends the window to the whole screen. How to Select Full-Screen Option on VirtualBox? How to Make VirtualBox Actually Full Screen. How to Select Full-Screen Option on VirtualBox?.
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