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[Stefan Bader <stefan.bader@xxxxxxxxxxxxx>]

So Alberto, I filed bug #1431753 against one nvidia source package.
Though this likely needs the same approach in all of those having the
nvidia + nvidia-uvm split. I re-checked this morning and can now say
that accessing the build directory of another DKMS module never can work
because the kernel post-install hook will end up compiling the DKMS
modules in parallel (to speed up that step). And this will rather likely
fail with a setup like nvidia. It currently only gets along because we
trigger the build (accidentally or not) 3 times.

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https://bugs.launchpad.net/bugs/1427175

Title:
  dkms postinst should handle missing headers

Status in dkms package in Ubuntu:
  Confirmed

Bug description:
  In the kernel post-install script of DKMS we have the following:

  if [ -x /usr/lib/dkms/dkms_autoinstaller ]; then
      exec /usr/lib/dkms/dkms_autoinstaller start $inst_kern > /dev/null
  fi

  if ! _check_kernel_dir $inst_kern ; then
      echo "dkms: WARNING: $kernel headers are missing, which may explain the above failures." >&2
      echo "      please install the $header_pkg package to fix this." >&2
  fi

  Supposedly the intention is to produce a warning if the kernel-headers
  are missing (might also cause the overall exit code to be 0). But
  execution of this script stops and is replaced by the
  dkms_autoinstaller when using exec. So it probably should be:

  if [ -x /usr/lib/dkms/dkms_autoinstaller ]; then
    if ! /usr/lib/dkms/dkms_autoinstaller start $inst_kern > /dev/null; then
      if !_check_kernel_dir $inst_kern ; then
     ...

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