virtualbox change screen size code example

Example 1: virtualbox screen size too small

follow the steps:
It is recommended that you set 128 MB of video memory, as when a video mode with higher resolution is used, more video memory is needed. You can also enable 2D and 3D acceleration.

open cmd:
cd "c:\Program Files\oracle\virtualbox"
VBoxManage setextradata "NAMEOFVM" VBoxInternal2/EfiGraphicsResolution 1920x1080

Example 2: virtualbox fullscreen resolution

sudo apt-get install virtualbox-guest-dkms
sudo dpkg-reconfigure virtualbox-guest-dkms

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