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[Tully <1401390@xxxxxxxxxxxxxxxxxx>]

I have tested using trusty-proposed sources and the problem is fixed.

I asked for apt-get install libhwloc-dev and it installed only 36
dependencies including ocl-icd-libopencl1 and not the nvidia packages.
The versions I ended up with are:

# dpkg -l | grep hwloc
ii  libhwloc-dev:amd64              1.8-1ubuntu1.14.04.1         amd64        Hierarchical view of the machine - static libs and headers
ii  libhwloc-plugins                1.8-1ubuntu1.14.04.1         amd64        Hierarchical view of the machine - plugins
ii  libhwloc5:amd64                 1.8-1ubuntu1.14.04.1         amd64        Hierarchical view of the machine - shared libs

-- 
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/1401390

Title:
  apt-get install  nvidia-331 triggers 691 packages to be installed

Status in hwloc package in Ubuntu:
  Fix Committed
Status in nvidia-graphics-drivers-331 package in Ubuntu:
  Invalid
Status in hwloc source package in Trusty:
  Fix Committed
Status in nvidia-graphics-drivers-331 source package in Trusty:
  Invalid
Status in hwloc source package in Utopic:
  Fix Committed
Status in nvidia-graphics-drivers-331 source package in Utopic:
  Invalid

Bug description:
  SRU request:

  Please accept hwloc into trusty-proposed.

  [Rationale]
  The libhwloc-plugins package need to depend on ocl-icd-libopencl1 (>= 1.0) | libopencl1 rather than just on libopencl1, since the nvidia driver provides libopencl1 too now.

  [Impact]
  Without a rebuild, the libhwloc-plugins package will pull in the nvidia driver and a massive amount of packages which are not needed (or even recommended). ocl-icd-libopencl1 is the only recommended loader, as NVIDIA's only work with the nvidia driver.

  [Test Case]
  After installing the update, users should be able to install libhwloc-plugins without having nvidia-331 installed as a dependency

  [Regression Potential]
  Low. This is a mere no change rebuild. We only need to make sure that all the newly generated dependencies do not affect the system.


  
  ----------------------------

  There appears to be a package dependency cascade that occurred approx
  12 hours ago.  Attempting to install libboost-all-dev causes this:  "0
  upgraded, 791 newly installed, 0 to remove and 3 not upgraded."

  The 791 packages include much of the gnome and kde desktops, a web
  browser, some chat clients, all of X11 .. which is crazy for a package
  needed to compile C++ programs for a server.

  I traced the dependencies: its a rather long, boring chain ... it
  depends on stuff which depends on  libboost-mpi1.54.0  which causes
  694 packages to be installed

  Tracing through eventually leads to  libhwloc5 which seems like it
  should be harmless ..  but that leads to libopencl1  which is a
  virtual package.  If you recall, opencl is a GPU general-purpose-
  computing thing, so, unsurprisingly, we see a dependence on nvidia:

  Package libopencl1 is a virtual package provided by:
    nvidia-libopencl1-331-updates 331.113-0ubuntu0.0.4
    nvidia-libopencl1-331 331.113-0ubuntu0.0.4
    nvidia-libopencl1-304-updates 304.125-0ubuntu0.0.1
    nvidia-libopencl1-304 304.125-0ubuntu0.0.1
    ocl-icd-libopencl1 2.1.3-4

  Next: apt-get  install nvidia-libopencl1-331-updates  results in: 0
  upgraded, 681 newly installed, 0 to remove and 3 not upgraded.

  Tracing through that, we get to  nvidia-331-updates  which requires nvidia-prime which causes this:
  0 upgraded, 696 newly installed, 0 to remove and 3 not upgraded.

  This is on a server that doesn't have a graphics card ..

  It appears that nvidia-prime is the prime suspect, here: somehow,
  libhwloc5 , through libopencl, requies nvidia drivers  to be
  installed, but the nvidia drivers require a package that cause the
  gnome+kde desktops to be installed ...

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