Comment 6 for bug 544864

As a note - this is actually an assert failure in nspluginwrapper, rather than flashplayer itself - which is needed for the 32-bit flash player on 64-bit ubuntu - as a result it can be worked around by manually installing the native 64-bit adobe flash plugin from http://labs.adobe.com/downloads/flashplayer10_64bit.html (simply copy libflashplayer.so to $HOME/.mozilla/plugins - you may need to create the directory).