In this case I can see only the last screen shown from the VM before the full screen. The logs above are taken when the guest VM Linux Mint has low Video Memory and full screen is activated for resolution: 2560x1440. The logs will help you to find what is causing the problem no matter of the VMs - Ubuntu, Linux Mint or Windows.įor example: 00:01:36.555713 GUI: UIMultiScreenLayout::update: GUI/AutomountGuestScreens is disabledĠ0:01:36.565931 GUI: UIFrameBufferPrivate::Notif圜hange: Screen=0, Origin=0x0, Size=2560x1367, Sending to async-handlerĠ0:01:36.567618 OpenGL: Set 3D content scale factor to (10000, 10000), multiplier 10000 (rc=VINF_SUCCESS)Ġ0:01:36.567663 OpenGL: Set OpenGL scale policy on HiDPI displays (fUnscaledHiDPI=0)Ġ0:01:36.569086 GUI: UIMachineViewFullscreen::adjustGuestScreenSize: Adjust guest-screen size if necessary.Ġ0:01:36.569101 GUI: UIMachineView::sltPerformGuestResize: Sending guest size-hint to screen 0 as 2560x1440 if necessary The first thing you need to start when you have problems with your programs and VirtualBox in this case are the logs. Ubuntu Linux add VirtualBox Guest Additions Step #1: Check logs of VirtualBox for errors If not you can follow how to install them in this article:

It's good idea to ensure that guest additions are installed for this Virtual Machine. Some of them are related to dual monitor setup, others to incorrect graphic settings. So after short investigation of the problem I found several possible problems and solution which I decided to wrap up in article. But again - successful install followed by black screen after boot of the machine.

I decided to install the older working version and see if the problem is solved. No matter of changing or resizing the window. I created new VM for the latest Linux Mint 19.3 which was installed successfully but after reboot the screen was black. I have VirtualBox with two working virtual machines(VM): Windows and Linux Mint.

Virtualbox black screen on boot