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I am using Virtual Box 5.0.0(Windows Vista) to run Ubuntu 14.04. The screen is too small (640x480) but the screen can up to 1280x768. How can I resizing it?

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You need to install the VirtualBox Guest Additions into Ubuntu. This gives a few benefits, including resizing the Ubuntu screen to match the host window.

Start the VM, then select from the VirtualBox menus:

Devices ⇒ CD/DVD Devices ⇒ VBoxGuestAdditions.iso

Then follow the instructions.

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    Note that you may also need to increase video RAM for the VM to get desired results – Elder Geek Aug 14 '15 at 1:50
  • Seems obvious, but also keep in mind to change the resolution in the guest OS. – Xtreme Biker Apr 10 '18 at 10:02
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    Under Virtualbox 6.0.4 on MacOS, the menu would be: Devices -> Insert Guest Additions CD image – Bon Feb 3 '19 at 12:30
  • In version 6.0 of Virtual Box the menu is Devices -> Insert Guest Additions CD image... then you will have to authenticate for the installtion to happen. – thanos.a Oct 29 '19 at 17:49
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Try this: Setting-->Display-->Scale Factor, change it

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I encountered the same problem on my PC recently. This is my solution;

Go to the Ubuntu machine:

Settings ⇒ Display ⇒ Graphics controller ⇒ Choose (VBoxSVGA or VBoxSVGA)

My original settings which caused the problem was VMSVGA.

This solution worked on my PC. I cannot guarantee that it will work on yours.

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