Tested Zesty daily and the fan started immediately after boot. When I do
nothing the system shuts down shortly after it enters the desktop.

But I found out following: I can reproduce it with Zesty daily and Xenial 
4.4.0-57.78 kernel.
The fan is on after boot. As soon as I enter the Desktop, I press FN+F12 which 
puts the system in sleep mode and the fan stops.
(In German the manual translates it with "toggle energy savings mode", in 
English it says "sleep toggle".)
After a waiting moment I press the power button, it enters the desktop (in 
Xenial after login) and the fan doesn't start again, System works fine.

Obviously kernel 4.9.0-040900rc6 does not trigger this. After a cold
start it proceeds without ever running the fan and shutdown.


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

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https://bugs.launchpad.net/bugs/1643341

Title:
  Unexpected shutdown

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