I have a Dell M65 Precision laptop which refuses to update to 1809.
If I allow the download and update, it reboots, and promptly locks up on the black loading screen.
If I download to a USB stick and boot off that to update, it locks up in the same place, early in the booting of the update process (before anything is applied).
Given the long list of complaints in this thread of similar problems, do you suppose that Microsoft and their crack engineers could eliminate it with the next update?