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[Alberto Milone <alberto.milone@xxxxxxxxxxxxx>]

The dependency of nvidia-libopencl1-331 on nvidia-331-uvm (which in turn
depends on nvidia-331) is correct. The problem here is that nvidia-
libopencl1-331 shouldn't have been installed in the first place.

I think we need to fix the problem in either libhwloc5 or in one of its
dependencies, as it should really depend on ocl-icd-libopencl1 rather
than on the libopencl1 virtual package.

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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 nvidia-graphics-drivers-331 package in Ubuntu:
  Confirmed

Bug description:
  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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