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[schlypel <1401591@xxxxxxxxxxxxxxxxxx>]

I found that the process of removing nvidia driver / returning to nouveau is prevented by a running service (nvidia-persistenced).
to get rid of the proprietary driver, do: "sudo kill <id of process>" and then you can use the hardware driver dialog to return to nouveau.
To find the id just do "ps -e | grep nvidia-persistenced"

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https://bugs.launchpad.net/bugs/1401591

Title:
  package nvidia-331 331.113-0ubuntu0.1 failed to install/upgrade:
  subprocess installed post-removal script returned error exit status 8

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

Bug description:
  I switched to the Nvidia driver not long before I updated the OS to
  the latest version.

  ProblemType: Package
  DistroRelease: Ubuntu 14.10
  Package: nvidia-331 331.113-0ubuntu0.1
  ProcVersionSignature: Ubuntu 3.16.0-26.35-generic 3.16.7-ckt1
  Uname: Linux 3.16.0-26-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  Date: Wed Dec 10 20:45:45 2014
  DuplicateSignature: package:nvidia-331:331.113-0ubuntu0.1:subprocess installed post-removal script returned error exit status 8
  ErrorMessage: subprocess installed post-removal script returned error exit status 8
  InstallationDate: Installed on 2014-12-05 (6 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  SourcePackage: nvidia-graphics-drivers-331
  Title: package nvidia-331 331.113-0ubuntu0.1 failed to install/upgrade: subprocess installed post-removal script returned error exit status 8
  UpgradeStatus: Upgraded to utopic on 2014-12-11 (0 days ago)
  modified.conffile..etc.modprobe.d.nvidia.331.hybrid.conf: [deleted]

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