with an update(17/11/2010) you may see here:
https://help.ubuntu.com/community/AMD64/FirefoxAndPlugins#!/bin/bash
# # Install Adobe Flash PLayer on your 64 bits distro
# # This script remove 32 bits versions and Gnash and swfdec free players
# # Thanks to Romeo-Adrian Cioaba, Tomtoom, Theozzfancometh.
echo "Shut Firefox, Opera and Chrome"
sudo killall -9 firefox
sudo killall -9 firefox-bin
sudo killall -9 opera
sudo killall -9 google-chrome
echo "Remove old Flash plugins:"
sudo apt-get remove -y --purge flashplugin-nonfree gnash gnash-common mozilla-plugin-gnash swfdec-mozilla
libflashsupport nspluginwrapper
sudo rm -f /usr/lib/mozilla/plugins/*flash*
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/chromium-browser/plugins/*flash*
sudo rm -rfd /usr/lib/nspluginwrapper
echo "Install Flash Player "Square" Preview 3 Release 64 bits"
cd ~
wget
http://download.macromedia.com/pub/labs/flashplayer10/flashplayer10_2_p3_64bit_linux_111710.tar.gz
tar zxvf flashplayer10_2_p3_64bit_linux_111710.tar.gz
sudo cp libflashplayer.so ~/.mozilla/plugins/
sudo cp libflashplayer.so /usr/lib/mozilla/plugins/
sudo cp libflashplayer.so /usr/lib/firefox-addons/plugins/
sudo cp libflashplayer.so /usr/lib/opera/plugins/
sudo cp libflashplayer.so /usr/lib/chromium-browser/plugins/
rm -rf libflashplayer.so
rm -rf flashplayer10_2_p3_64bit_linux_111710.tar.gz
echo "-----------------------------------------------------------------------"
echo "Done, Adobe Flash 64 bit \"Square - update 17 November, 2010\"
Preview 3 installed on your 64 bits system"
echo "-----------------------------------------------------------------------"
copy-paste this script into your text editor and save it as: flash64.sh
make this script executable:
right-clic on the flash64.sh icon -> select properties -> make executable then just double-clic or drag-n-drop onto the terminal window
If other solutions didn't work test this one
works fine with Opera and Google-chrome but i had problems with Firefox. There are so many plugins on Firefox: must be a conflict with another plugin or add-on, cause Epiphany my other Webkit browser works fine with flash
I have found: Tick off flashplugin-intaller (i forgot to tick it off in Synaptic and tick off flash-plugin nonfree too)
It was a conflict between two flash-plugins, now Firefox works with flash . if you type each lines by yourself mind the "rm --" command (may be harmfull) taste your flash-plugin
here --------------------------------------------------------------------------------------------------goto
Enlarge 1200x750
My Opera
PNG frames converted from GIF frames
Aurora borealis from a video at koreus.com 
Hello Vietnam ! Smile and never give up is fresh colored and very friendly at
His Opera browser is running on an unknown Unix system Impressionnant et puissant
