install flash player for x64 in ubuntu

1) download the tar.gz flash version from here
http://labs.adobe.com/technologies/flashplayer10/64bit.html
2) purge existing flash :

sudo apt-get purge flashplugin-installer flashplugin-nonfree nspluginwrapper

3) cd ~/Downloads

4) tar zxvf libflashplayer-10.0.42.34.linux-x86_64.so.tar.gz

5) sudo cp libflashplayer.so /usr/lib/mozilla/plugins

6) restart firefox
7) done!
:-D