Comment 46 for bug 178038

The solution has been posted on more than once already.... uninstall nspluginwrapper, the 32bit Flash plugin and manually install the 64bit one available from Adobe. It is leaps and bounds more stable compared to using the 32bit plugin. Honestly I dont quite understand why so many people are adverse to taking this route as using nspluginwrapper w/ 32bit Flash was originally meant as a workaround until a 64bit plugin arrived.

On another note, I dont understand why Ubuntu has not chosen to just distribute the 64bit plugin in its beta form as is. It isnt complete, still has bugs, but is better than nothing. If they were able to throw a beta Firefox on us a while ago, I dont see what their issue is with this...

FYI, for those looking for it Id recommend using the second to last release of the 64bit flash plugin and not the most recent release as it is a little less stable that its predecessor: http://download.macromedia.com/pub/labs/flashplayer10/libflashplayer-10.0.d21.1.linux-x86_64.so.tar.gz