VirtualBox is a cross-platform virtualization application that allows multiple operating systems at the same time. If you install Ubuntu OS on Windows Operating system you will Encounter the virtual screen size issue. This Helphin will guide you how to resize virtual screen in VirtualBox.
Step 1: Run your Virtual Operating system. In VirtualBox Window go to Virtual screen 1 under the View menu. Now you can see your inactive screen size. So you cannot resize your virtual screen display. Its more difficult to access your virtual operating system.
Step 2: Go to desktop and open Terminal.
Step 3: Type
sudo apt-get install virtualbox-guest-dkms and press Enter.
Step 4: Now type your superuser password and press Enter.
Step 5: Type Y and press Enter key to accept additional disk space requirement.
Step 6: Operation is processing for screen size.
Step 7: Virtual screen size operation is finishing done.
Step 8: Now restart your Ubuntu on VirtualBox.
Step 9: In VirtualBox windows go to Virtual Screen 1 under the View menu. You can see your all active virtual screen resolution. Now you can easily navigate your screen resolution.
Note: This is the resized Ubuntu operating system.
This How-To Helphin teach you how to set your virtual display resolution. Finally you can change , resize your VirtualbBox display screen resolution successfully.