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[teo1978 <teo8976@xxxxxxxxx>]

Indeed, I think I installed Bumblebee, because I thought that it would handle automatic switching between intel and nvidia as needed, but no way! it turns out it just allows you (or is supposed to allow, because I never managed to do even that)  to manually run stuff on NVidia. So, in practice I have (or used to have until this update) bumblebee, nvidia drivers, and the intel GPU actually used all the time with the nvidia card just sleeping and useless. And I don't care, as long as my system doesn't start freezing every time I unplug the external screen.
All was fine (except for the errors showing up at kernel updates), and now everything is broken again (i.e. nvidia drivers being used, and causing random freezes because they don't support Optimus - or at least that's the diagnosis I was given when I first had the problem a couple of years ago)

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to nvidia-graphics-drivers-331 in Ubuntu.
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:
  Confirmed
Status in nvidia-graphics-drivers-331-updates package in Ubuntu:
  Confirmed
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:
  Fix Released
Status in nvidia-graphics-drivers-340-updates source package in Trusty:
  Fix Released
Status in nvidia-graphics-drivers-346 source package in Trusty:
  Fix Released
Status in nvidia-graphics-drivers-346-updates source package in Trusty:
  Fix Released

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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