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[Launchpad Bug Tracker <1431753@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package nvidia-graphics-drivers-340 -
340.76-0ubuntu2

---------------
nvidia-graphics-drivers-340 (340.76-0ubuntu2) vivid; urgency=medium

  * debian/rules,
    debian/templates/control.in,
    debian/templates/dkms_nvidia_uvm.conf.in,
    debian/templates/nvidia-graphics-drivers-uvm.dirs.in,
    debian/templates/nvidia-graphics-drivers-uvm.install.in,
    debian/templates/nvidia-graphics-drivers-uvm.postinst.in,
    debian/templates/nvidia-graphics-drivers-uvm.prerm.in:
    - Build nvidia and nvidia-uvm together, as the latter
      build depends on the former (LP: #1431753).
    - Merge the -uvm package into the main nvidia driver
      package, and provide a transitional package for -uvm.
    - Make sure to remove all upstream dkms.conf files.
 -- Alberto Milone <alberto.milone@xxxxxxxxxxxxx>   Mon, 30 Mar 2015 17:09:32 +0200

** Changed in: nvidia-graphics-drivers-340 (Ubuntu)
       Status: Confirmed => Fix Released

** Changed in: nvidia-graphics-drivers-340-updates (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1431753

Title:
  Nvidia binary driver FTBS due to DKMS layer violation

Status in nvidia-graphics-drivers-331 package in Ubuntu:
  Invalid
Status in nvidia-graphics-drivers-331-updates package in Ubuntu:
  Invalid
Status in nvidia-graphics-drivers-340 package in Ubuntu:
  Fix Released
Status in nvidia-graphics-drivers-340-updates package in Ubuntu:
  Fix Released
Status in nvidia-graphics-drivers-346 package in Ubuntu:
  Fix Released
Status in nvidia-graphics-drivers-346-updates package in Ubuntu:
  Fix Released
Status in nvidia-graphics-drivers-331 source package in Trusty:
  Triaged
Status in nvidia-graphics-drivers-331-updates source package in Trusty:
  Triaged
Status in nvidia-graphics-drivers-340 source package in Trusty:
  Confirmed
Status in nvidia-graphics-drivers-340-updates source package in Trusty:
  Confirmed
Status in nvidia-graphics-drivers-346 source package in Trusty:
  Confirmed
Status in nvidia-graphics-drivers-346-updates source package in Trusty:
  Confirmed

Bug description:
  Filing this against the 340-updates version but possibly the same
  applies to older versions, too. The nvidia source package produces two
  individual dkms packages: nvidia-340-updates, nvidia-340-updates-uvm.
  The problem is that the DKMS build of the nvidia-uvm module runs
  compile steps inside the nvidia modules build directory. This is
  violating the DKMS assumption that each module can be build
  independently (there is no way of describing cross-modules
  dependencies and even more important, the autoinstall step after a new
  kernel is installed will run the modules build in parallel).

  Since nvidia and nvidia-uvm are very dependent on each other the right
  course of action seems to be to combine both sources in one DKMS
  module that produces two kernel modules (this is supported by DKMS).
  For the transition this resulting dkms package needs to have a
  breaks/replaces for the nvidia-uvm package.

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