How to use Ubuntu in full screen mode on virtualbox?
askubuntu.com › questions › 18425Apr 07, 2011 · In virtualbox [Host Key] + F works for fullscreening. By default your Host key will be Right Ctrl in VirtualBox. You can also change your host key,to change your host key open virtualbox and then goto File menu and choose preferences. In preferences choose input,you can see your host key there. You can change it if you need.