usb mouse & touchpads

[mc4man]

It's common if using a usb mouse to disable the touchpad. However if the mouse is removed or dies then proper behavior would be for the touchpad to be re-enabled.
That was prior behavior in Gnome/Ubuntu, no longer..
https://bugs.launchpad.net/ubuntu/+s...r/+bug/1540561

[vasa1]

I used Lubuntu 16.04 via a plain Live USB and a Live USB with persistence. In both, I had a mouse attached via USB cable to my laptop and both the mouse and touchpad were functional. I didn't try unplugging the mouse.

To my mind, there is no difference between Lubuntu 14.04 and Lubuntu 16.04 in this regard.

06:56 AM ~ $ uname -a
Linux vasa1-Inspiron-1545 3.13.0-83-generic #127-Ubuntu SMP Fri Mar 11 00:25:37 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
06:56 AM ~ $

[mc4man]

I used Lubuntu 16.04 via a plain Live USB and a Live USB with persistence. In both, I had a mouse attached via USB cable to my laptop and both the mouse and touchpad were functional. I didn't try unplugging the mouse.

The way it worked/works in gnome is this -
By default the touchpad is enabled.
When connecting a usb mouse, (wired or wireless), it becomes active & the touchpad remains active
The user disables the touchpad so they're just using mouse.

If they remove the mouse or it disconnects for whatever reason -
the old behavior was to immediately re-enable the touchpad
the new behavior is the touchpad remains disabled so no mouse/cursor, ect.