Comment 1 for bug 1726232

I found a work around for this problem. I added that same xrandr command (xrandr --output eDP-1-1 --rotate normal) near the bottom of my /etc/gdm3/Init/Default file, just before the "exit 0". This corrected my login screen orientation. I would still consider the fact that my Ubuntu upgrade felt that my screen needed to be rotated 180 degrees a bug, but this work around will suffice.