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Here's how to install Macromedia Flash 10 into a 64-bit version of Linux. These instructions are Ubuntu specific, but they should work with other versions as well as long as you can uninstall any existing flash players from your system and then install nspluginwrapper for your distribution.

You'll need to be root to do most of this.

A. Remove any previous installed flash and related apps (oss or otherwise, especially if you have installed ubuntu-restricted-extras).
apt-get remove
apt-get remove -y --purge flashplugin-nonfree gnash gnash-common mozilla-plugin-gnash swfdec-mozilla libflashsupport nspluginwrapper
rm -f /usr/lib/mozilla/plugins/*flash*
rm -f ~/.mozilla/plugins/*flash*
rm -f /usr/lib/firefox/plugins/*flash*
rm -rfd /usr/lib/nspluginwrapper

B. Install 32bit library and nspluginwrapper
apt-get install ia32-libs nspluginwrapper

C. Get the latest flashplayer from Macromedia (linux version, which is 32bit) and install it.
wget http://download.macromedia.com/pub/labs/flashplayer10/flashplayer10_inst...
mv {DOWNLOAD_PATH}/flashplayer10_install_linux_081108.tar.gz .
tar -xzvf flashplayer10_install_linux_081108.tar.gz
cp install_flash_player_10_linux/libflashplayer.so /usr/lib/mozilla/plugins/
nspluginwrapper -i /usr/lib/mozilla/plugins/libflashplayer.so
ln -sf /usr/lib/nspluginwrapper/plugins/npwrapper.libflashplayer.so /usr/lib/mozilla/plugins/
ln -sf /usr/lib/nspluginwrapper/plugins/npwrapper.libflashplayer.so /usr/lib/firefox-addons/plugins/