I use Opera, I have the latest version, and I just installed flash, it says to go to the Plugins menu and click 'Enable', however there is no Flash plugin on the PLugins menu. I found some answers relating to Windows saying to use a command line switch, such as here: http://forums.opera.com/discussion/comment/15193364#Comment_15193364, but I don't how to do this in Ubuntu.
I'm on the latest Ubuntu, 64-bit. Not sure what other details are needed.
Any help is appreciated.