Thanks for the assistance!

I tested kernel v4.8.0-040800-generic and it didn't fix the bug.
Regarding tags assigned.

Further two things for info (nothing new, just for the sake of completeness):
- I've a dualboot and the touchpad works on windows.
- System Settings -> Input Devices -> Touchpad shows red error message 
"Synaptics backend not found"

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

** Tags added: kernel-bug-exists-upstream

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  Touchpad not detected

Status in linux package in Ubuntu:

Bug description:
  After upgrade from kubuntu 14.04 to 16.04 the touchpad soon stopped
  working (meaning it even worked for some hours put then stopped). Now
  it is not detected anymore. It isn't listed when typing cat

  sudo apt-get install xserver-xorg-input-synaptics + reboot didn't

  Following this page: I
  assume it's related to the linux kernel and I updated my kernel to
  4.5.0-040500-generic but that didn't change anything neither.

  Laptop model: Dell XPS 13 Ubuntu edition (Intel® Core™ i7-4500U (4 Mo de 
mémoire cache, jusqu‘à 3 GHz))
  Touchpad manufacturer: Synaptics

  attached: /dmesg (I could add only one attachment!?)

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