package flashplugin-installer 10.3.183.10ubuntu5 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Lotd]

attempt to install flash using ubuntu software center while having firefox open in background.

ProblemType: Package
DistroRelease: Ubuntu 11.10
Package: flashplugin-installer 10.3.183.10ubuntu5
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.23-0ubuntu2
Architecture: amd64
Date: Sun Oct 9 12:51:55 2011
DuplicateSignature:
 Setting up flashplugin-installer (10.3.183.10ubuntu5) ...
 nspluginwrapper: /usr/lib/flashplugin-installer/libflashplayer.so is not a valid NPAPI plugin
 dpkg: error processing flashplugin-installer (--configure):
  subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110921.2)
SourcePackage: flashplugin-nonfree
Title: package flashplugin-installer 10.3.183.10ubuntu5 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #861584, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.