package appmenu-gtk (not installed) failed to install/upgrade: trying to overwrite shared '/etc/X11/Xsession.d/80appmenu', which is different from other instances of package appmenu-gtk:i386

it just came up with system problem detected and this was it

ProblemType: Package
DistroRelease: Ubuntu 13.04
Package: appmenu-gtk (not installed)
ProcVersionSignature: Ubuntu 3.8.0-30.44-generic 3.8.13.6
Uname: Linux 3.8.0-30-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: amd64
Date: Wed Sep 18 12:59:24 2013
DuplicateSignature: package:appmenu-gtk:(not installed):trying to overwrite shared '/etc/X11/Xsession.d/80appmenu', which is different from other instances of package appmenu-gtk:i386
ErrorMessage: trying to overwrite shared '/etc/X11/Xsession.d/80appmenu', which is different from other instances of package appmenu-gtk:i386
InstallationDate: Installed on 2013-04-05 (167 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130402.1)
MarkForUpload: True
SourcePackage: appmenu-gtk
Title: package appmenu-gtk (not installed) failed to install/upgrade: trying to overwrite shared '/etc/X11/Xsession.d/80appmenu', which is different from other instances of package appmenu-gtk:i386
UpgradeStatus: No upgrade log present (probably fresh install)