I haven’t tried Cubase on an 1803 machine yet, but one problem with a laptop was that the graphics driver was no longer able to load. It turns out this was caused by a new security feature called “Core Isolation” being turned on, and there’s a bug in the GUI that does not allow you to turn it off!
Luckily I found this post:
How to Turn On or Off Core Isolation Memory Integrity in Windows 10
Once I had made the registry change to disable it and rebooted, the graphics driver loaded and worked perfectly. It might be worth a try in your case as it sounds like it’s a problem loading the UR28M’s driver.