As of this writing, Flash does not work in 64 bit ubuntu.
Tested in Ubuntu 8.04, 8.10, 9.04
Flash 64 Bit
mkdir ~/.mozilla/plugins/
download and extract the latest tar.gz from http://get.adobe.com/flashplayer/?promoid=BUIGP
copy the libflashplayer.so file to ~/.mozilla/plugins
restart firefox
copy the libflashplayer.so file to ~/.mozilla/plugins
restart firefox
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