Fresh install of Linux Mint (Ubuntu 18.04) running UE 4.25 with Vulcan driver. I get a black screen (canvas) when I create a Blueprint. I drag a box to the canvas but see nothing but the box shows in the World Outliner panel.
The problem could be your Integrated Graphics. I experience the same problem running Unreal Engine where I get a blank screen. Looking at the requirements to run Unreal Engine it seems a dedicated graphics card is needed.
[Unreal Engine Hardware and Software Specifications][1]
This is what I see when running Unreal Engine on integrated graphics: