New answers tagged fullscreen
@Whaaaaat is correct. This is a bug with minecraft. A quick workaround is to press Alt+Tab and navigate back to Minecraft. Another workaround would be to pin Minecraft at the top of the launcher.
On Ubuntu you can always use Minetest, very similar to Minecraft but Ubuntu version and it is free. I like it better than Minecraft, then on minetest you can go on full screen.
In Virtual box, Start your virtual machine Go to Devices menu and select the last option Insert Guest Additions CD image
Have you tried using the xrandr command to see if the one you selected is available on your system?
Top 50 recent answers are included