*** This bug is a duplicate of bug 1369398 *** https://bugs.launchpad.net/bugs/1369398
I followed Lionel's steps and it worked for me too, so I suppose the drivers can't be uninstalled because they are being used by the process nvidia-persistenced. As lionel said, finding and killing the process lets you uninstall Nvidia's Propertary Drivers. -- 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/1378949 Title: package nvidia-331 331.89-0ubuntu5 failed to install/upgrade: subprocess installed post-removal script returned error exit status 8 Status in “nvidia-graphics-drivers-331” package in Ubuntu: Confirmed Status in “nvidia-graphics-drivers-331-updates” package in Ubuntu: Confirmed Bug description: Tried to switch to using NVIDIA binary driver - version 331.89 from nvidia-331-updates (proprietary) ProblemType: Package DistroRelease: Ubuntu 14.10 Package: nvidia-331 331.89-0ubuntu5 ProcVersionSignature: Ubuntu 3.16.0-21.28-generic 3.16.4 Uname: Linux 3.16.0-21-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.14.7-0ubuntu5 Architecture: amd64 Date: Wed Oct 8 12:05:05 2014 DuplicateSignature: package:nvidia-331:331.89-0ubuntu5:subprocess installed post-removal script returned error exit status 8 ErrorMessage: subprocess installed post-removal script returned error exit status 8 InstallationDate: Installed on 2012-04-02 (919 days ago) InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328) SourcePackage: nvidia-graphics-drivers-331 Title: package nvidia-331 331.89-0ubuntu5 failed to install/upgrade: subprocess installed post-removal script returned error exit status 8 UpgradeStatus: No upgrade log present (probably fresh install) modified.conffile..etc.modprobe.d.nvidia.331.hybrid.conf: [deleted] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-331/+bug/1378949/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp