package libasound2 1.0.25-3ubuntu3 [modified: usr/share/alsa/alsa.conf] failed to install/upgrade: trying to overwrite shared '/usr/share/alsa/alsa.conf', which is different from other instances of package libasound2:amd64

ran the following command from https://help.ubuntu.com/community/SoundTroubleshootingProcedure

sudo add-apt-repository ppa:ubuntu-audio-dev/ppa; sudo apt-get update;sudo apt-get dist-upgrade; sudo apt-get install pavucontrol linux-sound-base alsa-base alsa-utils gdm ubuntu-desktop linux-image-`uname -r` libasound2; sudo apt-get -y --reinstall install linux-sound-base alsa-base alsa-utils gdm ubuntu-desktop linux-image-`uname -r` libasound2; killall pulseaudio; rm -r ~/.pulse*; sudo usermod -aG `cat /etc/group | grep -e '^pulse:' -e '^audio:' -e '^pulse-access:' -e '^pulse-rt:' -e '^video:' | awk -F: '{print $1}' | tr '\n' ',' | sed 's:,$::g'` `whoami`

I was trying to fix the sound coming from my speakers and headphone together when headphones were connected

ProblemType: Package
DistroRelease: Ubuntu 12.10
Package: libasound2 1.0.25-3ubuntu3 [modified: usr/share/alsa/alsa.conf]
ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
Uname: Linux 3.5.0-18-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
Date: Sat Nov 17 03:14:33 2012
DuplicateSignature:
 Unpacking replacement libasound2:amd64 ...
 dpkg: error processing /var/cache/apt/archives/libasound2_1.0.25-3ubuntu3_amd64.deb (--unpack):
  trying to overwrite shared '/usr/share/alsa/alsa.conf', which is different from other instances of package libasound2:amd64
ErrorMessage: trying to overwrite shared '/usr/share/alsa/alsa.conf', which is different from other instances of package libasound2:amd64
InstallationDate: Installed on 2012-10-22 (25 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
SourcePackage: alsa-lib
Title: package libasound2 1.0.25-3ubuntu3 [modified: usr/share/alsa/alsa.conf] failed to install/upgrade: trying to overwrite shared '/usr/share/alsa/alsa.conf', which is different from other instances of package libasound2:amd64
UpgradeStatus: No upgrade log present (probably fresh install)