As you probably know, to get the most out of VirtualBox and its features, you must first install VirtualBox Guest Additions.
Indeed, these guest additions are drivers that allow your virtual machine to function properly, as well as provide some additional features (such as VirtualBox file sharing, for example).
To install them on Windows, just insert the virtual CD of the guest additions and click Next several times.
But, when you want to install them under Linux, this is slightly complicated.
Before you begin, be aware that some Linux distributions already include some or all of the guest additions necessary for Linux to work properly under VirtualBox.
Nevertheless, as indicated in the VirtualBox documentation, they are often incomplete or out of date.
It's therefore recommended to install the latest version of these with the virtual CD that came with your version of VirtualBox.
First, as stated in the VirtualBox documentation, it's recommended that you create a snapshot of your Linux virtual machine before you install the guest additions.
Thus, in case of problem, you can restore your virtual machine to its previous state instead of having to completely reinstall Linux in your VM.
For this :
To learn more about this feature, see our article : VirtualBox - Create a backup (snapshot) of your virtual machine
Specify "clean install" as the name (for example).
Then, start your virtual machine.
Since there are many Linux distributions (including the best known : Ubuntu, Debian, Cent OS and Red Hat), VirtualBox will first compile the guest additions to be compatible with your Linux distribution.
In our case : Ubuntu 18.04 in 64 bits (x64).
To be able to compile guest additions, the guest additions installer will need these packages : gcc, make and perl.
If not, you may see this message:
This system is currently not set up to build kernels modules Please install the gcc make perl packages from your distribution.
To install them on Ubuntu or Debian, use this command :
sudo apt-get install gcc make perl
Once the installation of the required packages is complete, go to the Devices menu of VirtualBox and click on : Insert Guest Additions CD image.
When the message "VBox_GAs_5.2.8 contains software intended to be automatically started. Would you like to run it?" appears, click Run.
Enter your password and click : Authenticate.
Now, the "VirtualBox Guest Additions Installation" program is displayed and the compilation and installation of guest additions is done.
As mentioned before (Running kernel modules will not be replaced until the system is restarted), you will need to reboot your Linux virtual machine.
Now, guest additions are installed.
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