Not sure how significant or helpful this will be / is, but I briefly tried the pre-built package (2020-07-06_23-54-14_linux_x64.zip) on Ubuntu 20.04 with Unity 7.5.0 (non-standard) and a 4k screen. From my limited testing, it seemed to work fine with only minor issues.
There was an apparent DPI scaling issue on the editor menus where the text was displayed too large. The JAVA2D renderer appeared to have what I assume is the same scaling issues with dimensions not displaying as expected (but I assume that renderer is going away…?).
Screenshots below are 3 vs 4 with a 14pt editor font. The editor font in 4 seems reasonably scaled on my screen, but not the menus. The menus on 3 seem a little strange when compared to Firefox for example, but reasonably sized.
Using FX2D produced the warnings below, but it appeared to not affect the output. IE It looked like anti-aliasing worked fine.
Nov 30, 2020 9:54:56 AM javafx.scene.Scene <init>
WARNING: System can't support ConditionalFeature.SCENE3D
Nov 30, 2020 9:54:56 AM javafx.scene.Scene <init>
WARNING: System can't support antiAliasing
With P3D or P2D I still get the following spew (from JOGL I believe) when closing sketches which has been around for quite a while I think.
X11Util.Display: Shutdown (JVM shutdown: true, open (no close attempt): 2/2, reusable (open, marked uncloseable): 0, pending (open in creation order): 2)
X11Util: Open X11 Display Connections: 2
X11Util: Open[0]: NamedX11Display[:0, 0x7f0924001730, refCount 1, unCloseable false]
X11Util: Open[1]: NamedX11Display[:0, 0x7f09241e7d80, refCount 1, unCloseable false]