You can download it here:http://labs.adobe.com/downloads/flashplayer10.html

Make sure that you uninstall any other version of flash player you’ve installed before trying to run the new one.
If you’re running Ubuntu, use the Synaptic Package Manager to search for and remove any previous versions of flash.
Then, just copy the libflashplayer.so to your plugins folder, on Ubuntu-8.10×64, this location is usually /usr/lib/mozilla or /usr/lib/firefox-{version}

Loads quickly, plays smoothly in full screen. Thanks, Adobe!