SOLVED!! Ubuntu 11.04 (Natty Narwhal) 64bits and flash problems

Download flash player 64bits beta for linux from here :

Adobe Labs Download

Quick link : Download plug-in for 64-bit Linux (TAR.GZ, 4.1 MB)

tar -xvzf flashplayer10_2_p3_64bit_linux_111710.tar.gz
sudo cp libflashplayer.so /usr/lib/mozilla/plugins/

if in firefox dont works, try to check plugins at tools->add-ons, then plugins. I had two flash plugins, after disabling the old one flash was working!

for chromium

sudo cp libflashplayer.so /usr/lib/chromium-browser/plugins