update to #49
even after installing 18.04 updates on Jan 2nd the following feature persists: 
a few times a week the cursor goes nuts - it looks like it's jumping to the 
lower left corner (gnome desktop), clicking, and thereby calling the program 
tiles onto the screen. Then clicking again making the tiles disappear, clicking 
again calling the tiles,..... sometimes with quite a high frequency, turning 
the laptop pretty much useless when it's "trapped" in this state. Whatever you 
try it's always calling the tiles :-(
This happens even if I'm not touching the notebook at all!!
I couldn't find anything to influence this behavior. Even after rebooting it 
continues! But at some random point in time the jumping stops and the notebook 
can be used as before and works like a charm - until the jumping starts again.

Because I used the fix from @keringar (see above) the on screen keyboard
is not coming any more. But for me it looks that the root cause of the
osk popping up is the cursor jump/click.

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https://bugs.launchpad.net/bugs/1723857

Title:
  onscreen keyboard appears whenever i touch touchscreen

Status in GNOME Shell:
  Confirmed
Status in gnome-shell package in Ubuntu:
  Triaged
Status in gnome-shell source package in Artful:
  Triaged

Bug description:
  Impact
  ======
  I'm in 17.10. Whenever I touch the touchscreen, the keyboard appears. It is 
disabled in System Preferences > Universal Access.  This didn't happen in any 
previous Ubuntus, including 17.04 GNOME, nor in Fedora, which is GNOME based.

  Test Case
  =========
  0. Find a laptop with a touch screen that works.
  1. Settings > Universal Access > Typing > Screen Keyboard = OFF
  2. Touch the screen.

  Regression Potential
  ====================

  Workaround
  ==========
  https://extensions.gnome.org/extension/1326/block-caribou/

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