Maybe MATE is not, which is why it works. Ubuntu uses Unity and for me Mint uses Cinnamon, both of which are 3D accelerated Desktop Environments. Strangely, when I move the fullscreen to my second monitor and log back in, the mini-tool now becomes visible whilst in the desktop environment. I have the exact same issue with the fullscreen mini-tool bar, but logging out of Mint makes the toolbar appear. I'm running Mint 17 圆4 as my guest on my Win7 圆4 host. When the login screen appears, you should be able to either see the mini-tool bar or you can press the HOST+Home keys to make it visible and it should show up. While in fullscreen mode in VirtualBox, log out of Ubuntu.
To find out or modify the host key, follow the steps below.This is still a problem/bug and is references in the VirtualBox bug tracker here: In case, if pressing the Right Ctrl + C doesn’t exit scaled mode, then there is a strong probability that your host key might be a different one. What If Host Key is Different from the Default One? It would simply activate your VirtualBox tabs at the top from where you can modify settings as per your requirement.
So, while in scaled or full screen mode inside VirtualBox installed on Windows, you need to press Right Ctrl + C key combination to exit scaled mode. In Mac, the default host key is usually Left Command button. In Windows, host key is usually set to Right Ctrl on keyboard. A host key in VirtualBox is a dedicated key that returns the ownership of peripheral devices (Keyboard & Mouse) to the host operating system. You might be wondering about the Host Key. You just need to press a combination of Host key and C on your keyboard (Host Key + C). In order to exit scaled mode in VirtualBox, you need to follow below mentioned steps. In this mode, you might be having trouble in getting back to the Window mode or you might want to change settings of your virtual machine without restarting your VitualBox software. While using VirtualBox for emulating another operating system on your OS, you may have unknowingly entered into full screen or scaled mode.
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