package appmenu-gtk3 0.3.0-0ubuntu1 failed to install/upgrade: appmenu-gtk3:i386 0.3.0-0ubuntu1 (Multi-Arch

The error comes up every time on bootup.

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: appmenu-gtk3 0.3.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-12.21-generic 3.2.2
Uname: Linux 3.2.0-12-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
Date: Thu Feb 2 02:13:53 2012
DuplicateSignature:
 Unpacking libgtk-3-0:i386 (from .../libgtk-3-0_3.3.10-0ubuntu3_i386.deb) ...
 dpkg: error processing /var/cache/apt/archives/appmenu-gtk_0.3.0-0ubuntu1_i386.deb (--unpack):
  appmenu-gtk:i386 0.3.0-0ubuntu1 (Multi-Arch: no) is not co-installable with appmenu-gtk:amd64 0.3.0-0ubuntu1 (Multi-Arch: no) which is currently installed
ErrorMessage: appmenu-gtk3:i386 0.3.0-0ubuntu1 (Multi-Arch
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
SourcePackage: appmenu-gtk
Title: package appmenu-gtk3 0.3.0-0ubuntu1 failed to install/upgrade: appmenu-gtk3:i386 0.3.0-0ubuntu1 (Multi-Arch
UpgradeStatus: Upgraded to precise on 2012-02-01 (2 days ago)