I don't know why this bug was only fixed in unity and not in update-manager, but here's a workaround for those of us not using unity (since all the other workarounds posted here don't work):
sudo apt-get install wmctrl wmctrl -F -r "Software Updater" -e 0,0,10,600,700
I don't know why this bug was only fixed in unity and not in update-manager, but here's a workaround for those of us not using unity (since all the other workarounds posted here don't work):
sudo apt-get install wmctrl
wmctrl -F -r "Software Updater" -e 0,0,10,600,700