If you just installed Ubuntu 14.4 LTS and you get annoyed by mouse cursor blinking all the time, then you get fix it disabling the “Unknown Display”.
Open the Unity Control Center clicking in the gear icon at application bar or executing the command “unity-control-center –overview”.
Then click in the “Displays” icon and in the new screen click on “Unknown Display” and change it from “ON” to “OFF” to disable it.
Finally click on Apply and the cursor will stop to blink.