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My monitor is 1920 x 1200 and the computer is running Windows 7.

Using VirtualBox and Ubuntu 10.04, the screen of the Ubuntu can only be 800 x 600 or 640 x 480. Is there a way to change that.

I resized the VirtualBox window and Ubuntu still thinks the max is 800 x 600.

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migrated from May 23 '10 at 15:17

This question came from our site for system and network administrators.

up vote 22 down vote accepted

Try installing the guest additions.

Inside the window holding your virtual machine you can go to one of the menu options and select to install guest additions. It will mount a CD in the virtual machine where you will be able to run the installation scripts from.

The article below describes the complete installation process in more detail:

Install VirtualBox Guest Additions on VirtualBox Guests

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I had the same problem yesterday. Installing the Guest Additions in Ubuntu resolved the issue. This is the article I found on VirtualBox's official forum that describes how to install the Guest Additions in any Linux distros.

Howto: Install Linux Guest Additions + Xorg config

Once the installation was done and Ubuntu was restarted, Ubuntu was able to detect my host OS' (Windows 7) screen resolution and adjust automatically.

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I had this problem, and it was because my physical screen resolution is 1024x768.

Uncheck: View > Auto-resize Guest Display

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Excellent! Having got it working once and then somehow breaking it without realising how, this fixed it. Thanks! – Richard Turner Jul 9 '12 at 10:08

My answer is related to console mode Linux only. So, please be aware of that.

If you are using Linux with no X-Window installed (like usually servers do) than you'll need to edit /etc/default/grub file adding following lines:


Then update grub config:

sudo update-grub

and reboot your VirtualBox instance.

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according to my information, the screen resolution is tied to the virtual video card and the virtual monitor connected to it.

check the specifications of these devices in your VM monitor.

I believer 800 x 600 is what you can get since it requires a Virtual GPU

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  1. Open terminal.

  2. Type: sudo apt-get install virtualbox-guest-dkms

Boom. Done.

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  1. Search for Terminal

  2. Open Terminal

  3. Type : Sudo apt-get install virtualbox-guest-dkms

  4. Wait Until It dones (if anything press enter,Y,OK

  5. if it done. type : Exit

  6. Restart your Ubuntu by clicking Shutdown then click Restart!

  7. If you have black screen wait for 5 minute or above .

  8. Insert Guest additions in your virtualbox.

  9. If it said Force Unmount or Unmount .. PRess Cancel!

  10. You i'll see its finished now! Press CTRL(right) + F

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How is this different than earlier answers? – Dave M Oct 25 '14 at 18:41
What!!! So you mean to tell me that you don't even have to run file in the guest addition iso file. I just did what you listed here and it worked.... – ThN May 25 '15 at 7:22

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