On virtualbox with debian, the full screen doesn’t work by default. Fortunately it’s possible to correct this fairly quickly.
Like 99.99% of people, you miss a thing called Guest Additions. They are not avaible and so you have this full screen issue when you use Virtual Box with windows.
How install guest additions on Virtual Box?
Lucky for you with only a few CLI commands, it will be ok.
So open an CLI interface, log you as root with su command and here we go.
Step 1 – Update your system if necessary
apt-get update && apt-get upgrade
Step 2 – Install required packages
apt-get install build-essential module-assistant
Step 3 – Configure your system for building kernel modules by running
Step 4 – On Virtual Box interface
Click to the Devices menus and then click on Insert Guest additions CD images. A pop-up will appear, just click on the button Run
Step 5 – Now return on linux CLI and type
Step 6 – The last command
Just follow the instructions for finish.
Step 7 – Restart debian on Virtual Box
Finally, just restart Debian and now you will see, it’s on full screen.