Making flash player work in Ubuntu 9.10 64 bit

sudo apt-get remove --purge flashplugin-nonfree gnash gnash-common mozilla-plugin-gnash
sudo apt-get remove --purge swfdec-mozilla libflashsupport nspluginwrapper iceape-flashplugin
sudo apt-get remove --purge iceweasel-flashplugin mozilla-flashplugin firefox-flashplugin
sudo apt-get remove --purge xulrunner-flashplugin midbrowser-flashplugin xulrunner-addons-flashplugin
sudo rm -f /usr/lib/mozilla/plugins/npwrapper.libflashplayer.so
sudo rm -f /usr/lib/iceweasel/plugins/npwrapper.libflashplayer.so
sudo rm -f /usr/lib/firefox/plugins/npwrapper.libflashplayer.so
sudo rm -f /var/lib/flashplugin-nonfree/npwrapper.libflashplayer.so
sudo rm -f ~/.mozilla/plugins/npwrapper.libflashplayer.so
sudo rm -f /usr/lib/firefox-addons/plugins/npwrapper.libflashplayer.so
sudo rm -f ~/.mozilla/plugins/*flash*
sudo rm -f /usr/lib/firefox/plugins/*flash*
sudo rm -f /usr/lib/firefox-addons/plugins/*flash*
sudo rm -f /usr/lib/mozilla/plugins/*flash*





sudo wget http://download.macromedia.com/pub/labs/flashplayer10/libflashplayer-10.0.45.2.linux-x86_64.so.tar.gz


sudo tar xzf libflashplayer-10.0.45.2.linux-x86_64.so.tar.gz
sudo mv libflashplayer.so /usr/lib/mozilla/plugins


restart firefox and test flash on youtube.

source : http://ubuntuforums.org/showthread.php?t=1081964