package nvidia-331-updates (not installed) failed to install/upgrade: conflicting packages - not installing nvidia-331-updates

[Ben]

Trying to roll back to proprietary drivers, and I am encountering this error.

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: nvidia-331-updates (not installed)
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.3
Architecture: amd64
Date: Sat Aug 9 20:50:14 2014
DpkgTerminalLog:
 Preparing to unpack .../libcuda1-331-updates_331.38-0ubuntu7.1_amd64.deb ...
 De-configuring libcuda1-304-updates (304.117-0ubuntu1) ...
 Unpacking libcuda1-331-updates (331.38-0ubuntu7.1) ...
 dpkg: error processing archive /var/cache/apt/archives/libcuda1-331-updates_331.38-0ubuntu7.1_amd64.deb (--unpack):
  trying to overwrite '/usr/lib/x86_64-linux-gnu/libcuda.so.1', which is also in package libcuda1-304-updates 304.117-0ubuntu1
DuplicateSignature: package:nvidia-331-updates:(not installed):conflicting packages - not installing nvidia-331-updates
ErrorMessage: conflicting packages - not installing nvidia-331-updates
InstallationDate: Installed on 2013-04-15 (481 days ago)
InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1)
SourcePackage: nvidia-graphics-drivers-331-updates
Title: package nvidia-331-updates (not installed) failed to install/upgrade: conflicting packages - not installing nvidia-331-updates
UpgradeStatus: Upgraded to trusty on 2014-08-04 (5 days ago)