I have not opened anything. Sequence goes like
this.
1. Close all Windows leaving the Kubuntu desktop on view.
2. Plug in a USB device, after a few seconds a Dialog Box appears
telling me that the device has been recognised and giving me
options of what to do next.
3. On the right hand side of the Box is an arrow symbol which
may be clicked to disconnect the USB device and allow safe
removal.
4. Such a click brings up another couple if lines of dialog saying
the device can be moved as one or more files are being used
by an application.

This has only appeared (I think) since I upgraded to 10.10.