The work-around I mentioned above (booting recovery + continue) does not
seem to work reliably. It just took me half an hour to have a successful
boot, to provide the apport-collect. A few more observations:

- For some reason my xorg.conf had been renamed to xorg.conf.11142015, without 
any xorg.conf in place. Apparently this must have happened yesterday, when my 
previous work around stopped working. I had the successful boot after renaming 
it back, but right now I don't dare to try out if this works systematically.
- Using kernel version 3.13.0-63 and earlier, X starts successfully and I end 
up with the default display manager. However, trying to log in results in an 
infinite loop of restarting the display manager. Furthermore, there seems to be 
a graphics issue: Even though the resolution seems to be standard 1080p, the 
image does not fill the entire screen area and sometimes the output is totally 
broken (very large stretch vertically, i.e., streching about 100 pixels over 
the entire screen plus strange color artifacts)

** Package changed: linux (Ubuntu) => ubuntu

** Changed in: ubuntu
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1516216

Title:
  X fails to start, starting with kernel version 3.13.0-66 including
  3.13.0-68

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