Public bug reported:

kubuntu 15.10 has been running fine. Today there was a set of kernel reboots 
available from 4.2.0.16 to 4.2.0.17
After rebooting, X did not comes.
console still works
Logging into the console and running startx  fails
dpkg-reconfigure xorg does nothing
booting to the previous kernel succeeds but has the same symptoms
booting with a live disk works fine, so the problem is not with the hardware
I assume the update stepped on some config files for X11 -- what should I be 
looking at in the brave new world of systemd?
How do I reconfigure the Xserver? or copy the settings over from the livedisk 
environment?
And how do we make sure this doesn't happen again the next time there is a 
kernel update?

(This report is being made from another machine that actually works.)

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: update xserver

** Description changed:

- kubuntu 15.10 has been running fine. Today there was a set of kernel reboots 
available from 4.3.0.16 to 4.2.0.17
- After rebooting, X did not comes. 
+ kubuntu 15.10 has been running fine. Today there was a set of kernel reboots 
available from 4.2.0.16 to 4.2.0.17
+ After rebooting, X did not comes.
  console still works
- Logging into the console and running startx  fails 
+ Logging into the console and running startx  fails
  dpkg-reconfigure xorg does nothing
- booting to the previous kernel succeeds but has the same symptoms 
+ booting to the previous kernel succeeds but has the same symptoms
  booting with a live disk works fine, so the problem is not with the hardware
  I assume the update stepped on some config files for X11 -- what should I be 
looking at in the brave new world of systemd?
  How do I reconfigure the Xserver? or copy the settings over from the livedisk 
environment?
  And how do we make sure this doesn't happen again the next time there is a 
kernel update?
  
  (This report is being made from another machine that actually works.)

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https://bugs.launchpad.net/bugs/1514028

Title:
  xserver fails after kernel update to 4.2.0.17 on kubuntu 15.10

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