package libstdc 5 (not installed) failed to install/upgrade: libstdc 5: 1

[Dan Schneider]

It happened when i was trying to force install a 32bit version of the package on a 64bit machine

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: libstdc++5 (not installed)
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
AptOrdering:
 libstdc++5: Install
 libstdc++5: Configure
Architecture: amd64
Date: Thu Jun 23 09:15:09 2011
DpkgTerminalLog:
 dpkg: error processing /var/cache/apt/archives/libstdc++5_1%3a3.3.6-21ubuntu1_amd64.deb (--unpack):
  libstdc++5: 1:3.3.6-21ubuntu1 (Multi-Arch: no) is not co-installable with libstdc++5:i386 1:3.3.6-17ubuntu1 (Multi-Arch: no) which is currently installed
ErrorMessage: libstdc++5: 1
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110426)
SourcePackage: gcc-3.3
Title: package libstdc++5 (not installed) failed to install/upgrade: libstdc++5: 1
UpgradeStatus: No upgrade log present (probably fresh install)