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How To Fix Virtualbox Display Resolution Not Changing

Ubuntu 9

In this article, we will explore various ways to troubleshoot and resolve the issue of the display resolution not changing when resizing the VirtualBox window. VirtualBox is a powerful virtualization product that allows users to run multiple operating systems on their computer simultaneously. However, like any software, it can sometimes encounter problems. One such issue is the display resolution not changing when resizing the VirtualBox window. Let’s dive in and see how we can fix this.

Understanding the Issue

When using VirtualBox, you may find that the display resolution of your virtual machine doesn’t change when you resize the VirtualBox window. This can be frustrating as it limits your ability to utilize the full screen for your virtual machine. This issue can occur due to various reasons, such as incorrect settings, missing drivers, or issues with the Guest Additions.

Solution 1: Changing the Graphics Controller

One of the first things you can try is to change the Graphics Controller in the Display settings of your virtual machine.

  1. Open the settings of your virtual machine in VirtualBox.
  2. Navigate to the Display section.
  3. Change the Graphics Controller to “VBoxVGA”.

Please note that this might result in decreased graphics performance. If this doesn’t work, you can also try setting the Graphics Controller to “VBoxSVGA” and enable 3D acceleration.

Solution 2: Installing VirtualBox Guest Additions

Another possible solution is to install the “virtualbox-guest-additions-iso” package. This package provides drivers and system applications that optimize the guest operating system for better performance and usability.

To install this package, open a terminal window in your guest operating system and enter the following command:

sudo apt-get install virtualbox-guest-additions-iso

In this command, sudo gives you root privileges, apt-get is the package handling utility in Ubuntu, install is the command to install a package, and virtualbox-guest-additions-iso is the name of the package.

Solution 3: Reconfiguring DKMS

If you have recently upgraded your kernel, reconfiguring DKMS (Dynamic Kernel Module Support) might resolve the issue. To do this, run the following command in your guest operating system:

dpkg-reconfigure virtualbox-guest-dkms

In this command, dpkg-reconfigure is a utility to reconfigure an already installed package, and virtualbox-guest-dkms is the name of the package.

It’s also recommended to install the “dkms” package to ensure automatic rebuilding of VirtualBox kernel modules during kernel upgrades. You can do this by running:

sudo apt-get install dkms

Solution 4: Installing Proprietary Video Driver

Another potential solution is to install the proprietary video driver for VirtualBox in the guest machine. You can do this by checking for additional drivers in the Software & Updates settings of your guest operating system. After installing the driver, reset your machine to see if the issue is resolved.

Solution 5: Enabling Auto-Resize Guest Display

In some cases, enabling the “Auto-Resize Guest Display” option in the “View” menu of VirtualBox on the host machine can resolve the issue. This option automatically adjusts the display resolution of the guest operating system when you resize the VirtualBox window.

Solution 6: Reinstalling Guest Additions

If none of the above solutions work, you can try uninstalling the Guest Additions installed via apt and reinstalling them by inserting the ISO and running the .run file. This has been reported to work for some users.

Conclusion

In this article, we explored multiple potential solutions to the issue of the display resolution not changing when resizing the VirtualBox window. Remember, what works best may vary depending on your specific setup. We hope this guide helps you resolve the issue and improves your VirtualBox experience.

How do I change the display resolution in VirtualBox?

To change the display resolution in VirtualBox, you can try changing the Graphics Controller in the Display settings of your virtual machine. Open the settings of your virtual machine, navigate to the Display section, and change the Graphics Controller to "VBoxVGA" or "VBoxSVGA". You can also enable 3D acceleration for better graphics performance.

Why is my display resolution not changing when I resize the VirtualBox window?

The display resolution may not be changing when you resize the VirtualBox window due to incorrect settings, missing drivers, or issues with the Guest Additions. It’s recommended to try the solutions mentioned in the article, such as changing the Graphics Controller, installing VirtualBox Guest Additions, reconfiguring DKMS, installing proprietary video drivers, enabling Auto-Resize Guest Display, or reinstalling Guest Additions.

How do I install VirtualBox Guest Additions?

To install VirtualBox Guest Additions, you can open a terminal window in your guest operating system and enter the command "sudo apt-get install virtualbox-guest-additions-iso". This will install the necessary drivers and system applications to optimize the guest operating system for better performance and usability.

What is DKMS and why should I reconfigure it?

DKMS stands for Dynamic Kernel Module Support. It is a framework that allows the installation of kernel modules (drivers) to be automatically rebuilt when a new kernel is installed or upgraded. Reconfiguring DKMS can help resolve issues with VirtualBox by ensuring that the necessary kernel modules are properly installed and updated.

How can I enable the “Auto-Resize Guest Display” option in VirtualBox?

To enable the "Auto-Resize Guest Display" option in VirtualBox, you can go to the "View" menu of VirtualBox on the host machine and check the option. This will automatically adjust the display resolution of the guest operating system when you resize the VirtualBox window.

What should I do if none of the solutions work?

If none of the solutions mentioned in the article work, you can try uninstalling the Guest Additions installed via apt and reinstalling them by inserting the ISO and running the .run file. This has been reported to work for some users. If the issue persists, you may need to seek further assistance or explore other troubleshooting options specific to your setup.

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