I've been an ubuntu user for a few years now, and this may be my first problem ever (or at least the first I couldn't figure out quickly by myself).
I have a 3 monitor setup with monitor '2' on the left rotated 90 degrees, and monitors 1 and 3 in landscape mode.
Video card is a GTX 1060 6GB and I'm running nvidia-driver-440 (I also tested this with 390)
I updated to 20.04 today from 19.10 - all went smoothly, except monitor 2 will not rotate. If I try and rotate it, the screen refreshes, and it shows up overlapping my other monitors.
Will try the Nouveau drivers as well, but open to other ideas.