Comment 46 for bug 1268257

Not sure how, but this appears to have been fixed last week by:

nvidia-graphics-drivers-331-updates (331.89-0ubuntu6) vivid; urgency=medium

  * debian/templates/dkms_nvidia.conf.in,
    debian/dkms_nvidia/patches/buildfix_kernel_3.18.patch:
    - Add support for Linux 3.18.
      Thanks to Rico Tzschichholz for recommending the patch.
 -- Alberto Milone <email address hidden> Thu, 06 Nov 2014 16:31:25 +0100