I have installed Ubuntu 15.10 in a VirtualBox on a Windows 7 host. I have tried installing the Guest Additions both from the provided VirtualBox ISO as well as sudo apt-get install virtualbox-guest-x11, but in both cases it boots/works fine when "Enable 3D Acceleration" is unchecked, but when I check it the display does not work correctly (toolbars and windows are invisible, etc.). Does anyone know how to fix this?

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