package nvidia-346-updates 346.47-0ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2

While tryin to install updates for the binary nvidia drivers, dpkg fails with the following message:

Setting up nvidia-346-updates (346.47-0ubuntu1) ...
update-alternatives: error: /var/lib/dpkg/alternatives/glamor_conf corrupt: invalid status
dpkg: error processing package nvidia-346-updates (--configure):
 subprocess installed post-installation script returned error exit status 2
dpkg: dependency problems prevent configuration of nvidia-346-updates-uvm:
 nvidia-346-updates-uvm depends on nvidia-346-updates (>= 346.47); however:
  Package nvidia-346-updates is not configured yet.

dpkg: error processing package nvidia-346-updates-uvm (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
                            Errors were encountered while processing:
 nvidia-346-updates
 nvidia-346-updates-uvm
E: Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Package
DistroRelease: Ubuntu 15.04
Package: nvidia-346-updates 346.47-0ubuntu1
ProcVersionSignature: Ubuntu 3.19.0-7.7-generic 3.19.0
Uname: Linux 3.19.0-7-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.16.2-0ubuntu2
Architecture: amd64
Date: Mon Mar 9 21:16:29 2015
DuplicateSignature: package:nvidia-346-updates:346.47-0ubuntu1:subprocess installed post-installation script returned error exit status 2
ErrorMessage: subprocess installed post-installation script returned error exit status 2
InstallationDate: Installed on 2014-04-24 (319 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
SourcePackage: nvidia-graphics-drivers-346-updates
Title: package nvidia-346-updates 346.47-0ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2
UpgradeStatus: No upgrade log present (probably fresh install)