Public bug reported:

This problem occurs on the current development version of zesty; it does
not occur on any other Ubuntu version that is currently supported.

Lightdm offers the possibility to start the default on-screen keyboard
Onboard. Further, Onboard offers the possibility to start the hover
click, which is provided by a process called mousetweaks.

The hover click consists in having the system automatically perform a
left click (and optionally other click types) shortly after the pointer
stops moving. It is an accessibility feature for example for people that
are not able to click with an hardware device, like mouse buttons.

Here is how to start the hover click in lightdm: 
- Start the on-screen keyboard Onboard by using the accessibility menu at the 
top right. 
- Click on the key on the at the right of the Onboard layout that has a pointer 
as label; an additional column with keys will appear; these are the keys to 
control the hover click. 
- Click on the key at the bottom of the column that just appeared and that 
shows a pointer with a little clock. This is the key to start the hover click. 
In fact, it starts the mousetweaks process, that provides the hover click 
feature. 

The problem now is that the mousetweaks process started by Onboard in
lightdm is still running after entering the desktop session. This was
not the case in previous Ubuntu versions.

** Affects: lightdm (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1643700

Title:
  mousetweaks process does not get killed when entering desktop

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