I agree that good software should do this but unfortunately multi-monitor configuration software isn't always very good. My Ubuntu 15.10 system with Unity deskt

I agree that good software should do this but unfortunately multi-monitor configuration software isn't always very good. My Ubuntu 15.10 system with Unity desktop decides to move the taskbar/dock thing to the other monitor every time I turn the other monitor on in the morning. There is nothing in the Screen Display GUI that seems to allow me to stop this from happening. Out of frustration I've resorted to running the xrandr command a few times (once is sometimes not enough!) to fix it each time. This tool would at least automate the task for me and seems useful.