By default, the Ubuntu NotifyOSD notification bubbles are displayed on only one monitor in multi-monitor setups, which might be useful in some situations, but it doesn't make sense in most cases.
For instance, if you're working on something on one monitor and get a notification on the other one, you're almost never going to see it and... maybe it's an important notification and you don't want to miss it. So here's a quick tip on how to set the NotifyOSD notifications to follow the mouse in multi-screen environments so they show up on the display which contains the active window.
Firstly, if you don't have dconf-tools already, install it using the command below:
sudo apt-get install dconf-tools
Then run dconf-editor, navigate to apps > notifyosd and change the "multihead-mode" value from "dont-focus-follow" to "focus-follow".
That's it, the notification bubbles should now show up on the monitor you're currently working on (has the active window).
