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[Timo Jyrinki <timo.jyrinki@xxxxxxxxxxxxx>]

Hmm, this may have been fixed now in the upcoming 14.04.3 LTS HWE
upgrade, can anyone confirm?

That is, after purging the configuration files of -utopic packages, the
link /etc/X11/X is removed but system continues to work.

I upgraded by temporarily enabling trusty-proposed updates and sudo apt
install --install-recommends libgles2-mesa-lts-vivid libglapi-mesa-lts-
vivid xserver-xorg-lts-vivid libgl1-mesa-dri-lts-vivid libegl1-mesa-lts-
vivid libgl1-mesa-glx-lts-vivid:i386

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Packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1132736

Title:
  Xorg fails to start after installing the hardware enablement stack on
  precise due to missing symlink after purging old xserver-xorg

Status in xorg package in Ubuntu:
  Triaged
Status in xorg-lts-trusty package in Ubuntu:
  Confirmed
Status in xorg-lts-utopic package in Ubuntu:
  Confirmed
Status in xorg-lts-vivid package in Ubuntu:
  New

Bug description:
  Bug:

  The bug happens whenever the remaining configuration files of the
  original X stack is removed, ie purging. It does not happen for users
  who do not explicitly remove those.

  Workaround:

  For example, if upgraded 14.04 LTS to the 14.04.2 HWE stack
  (=14.10/utopic):

  sudo dpkg-reconfigure xserver-xorg-lts-utopic

  This restores the symlink /etc/X11/X -> /usr/bin/Xorg

  ---

  After installing the hardware enablement stack on precise by running:
  sudo apt-get install linux-generic-lts-quantal xserver-xorg-lts-quantal

  Xorg fail to start. There is no error message or anything, just a black screen. Switching to a vt i possible and lightdm/x-0.log shows that a symlink is missing:
  X: cannot stat /etc/X11/X (No such file or directory), aborting.

  I updates two computers running precise x86_64 and both had the
  problem.

  Just recreating the symlink fixes the problem and then precise runs
  perfectly fine with the new stack (in fact, it's more stable so far).

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