Follow this link for 32 bit kernel.
Follow this link if you are running amd 64 bit kernel

http://ubuntuforums.org/showthread.php?t=279990

https://help.ubuntu.com/community/FirefoxAMD64FlashJava

Adobe does not have a 64 bit flash player for linux.
Install 32 bit version of Ubuntu if you want to use adobe flash.

This is really stupid and very trivial, but I would like to play Farkle on
Facebook, but can't get flash to do it. It does everything but the game. It
shows it loading, but the game never comes.

Does anyone have any ideas for me?

Facebook games are very picky about flash versions.
Make sure you are running a 10 version. The other thing I fixed for a friend
yesterday on her netbook, was two versions of flash installed. Check what
version and whether you have two by typing about:plugins into firefoxes
address bar.

Thanks for the "about:plugins". I had downloaded 10 but found it wasn't
using it. When I switched to 10 it worked.

how did you get it to switch?.......

It may be looking for IE............