package flashplugin-installer 10.2.153.1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Kedar Apte]

Binary package hint: flashplugin-nonfree

Adobe flash player 10 could not be installed on 64 bit Natty desktop in the Classic Desktop Mode. Tried installing GNash Player as well, but faced the same issue.

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: flashplugin-installer 10.2.153.1ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Uname: Linux 2.6.38-5-generic x86_64
Architecture: amd64
Date: Wed Mar 30 16:41:16 2011
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110302)
SourcePackage: flashplugin-nonfree
Title: package flashplugin-installer 10.2.153.1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)