Removing an external mouse with touchpad disabled does not re-enable the touchpad

[Doug McMahon]

The past & current in 14.04 behaviour was to always re-enable the touchpad immediately if disabled upon removing an external mouse
(- either explicitly or having the mouse break or batteries go bad, ect.

Now the touchpad stays disabled, both in current session & after a reboot.
This seems to be poor behaviour as the user would need to manually re-enable the touchpad without the use of a mouse or get a working mouse, batteries, ect. to get the mouse back or re-enable the touchpad.

Also affects a gnome-session/gnome-control-center.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: unity-control-center 15.04.0+16.04.20160119-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-1.15-generic 4.4.0
Uname: Linux 4.4.0-1-generic x86_64
ApportVersion: 2.19.4-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Feb 1 14:55:19 2016
InstallationDate: Installed on 2016-01-14 (17 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160114)
SourcePackage: unity-control-center
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1540561

[Daniel van Vugt (vanvugt)]

Thank you for reporting this bug to Ubuntu.
Ubuntu GNOME 16.04 (xenial) reached end-of-life in April 2019.

https://ubuntugnome.org/ubuntu-gnome-16-04-lts-is-here/
https://wiki.ubuntu.com/XenialXerus/ReleaseNotes/UbuntuGNOME

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in.