Ubuntu: mouse jumps to trash icon / move to lower left corner / bottom left

There are many questions about jumping mouse cursors on ubuntu.
And there are often answers like

• clean your touchpad
• your touchpad is broken
• send your laptop back

But there are so many people suffering this, so it is not reasonable that all these touchpads do not work well.

One thing to solve this is to install

gpointing-device-settings

but this does not really help.
Next thing:

add-apt-repository ppa:atareao/atareao
apt-get update
apt-get install touchpad-indicator
/opt/extras.ubuntu.com/touchpad-indicator/bin/touchpad-indicator 

But this is not really the solution. But you can disable your touchpad while typing, so that the window focus does not jump to the trash icon and your typing is interrupted.

After searching i found the following discussion on a mailing list:
https://lists.freedesktop.org/archives/xorg-devel/2014-June/042790.html

And the follwing did the job:

apt-get install xserver-xorg-core apt-get install xserver-xorg-input-libinput
apt-get remove --purge xserver-xorg-input-synaptics

and then a logoff and login into the x window system...