I'm using Lubuntu 19.04 on my Mac in a Virtualbox VM. I'm noticing only in my taskbar an after image of what used to be the most recently loaded dialog. This problem only appears in the taskbar. In this case, you can see the faint image of "Battery Info" in the taskbar.
Is that a feature of Lubuntu 19.04, is that a video driver issue, or is it some other issue?