Earlier, Adobe Flash 10.2 Player "Square" was released for Windows, Mac and Linux - with 64-bit support.

If you want t install it in Ubuntu (9.10, 10.04 & 10.10), there is already a PPA just for that. Simply follow these steps:

Note: This is a prview; not the final release.

$ sudo add-apt-repository ppa:sevenmachines/flash

$ sudo apt-get update

$ sudo apt-get install flashplugin64-nonfree

[via: Ubuntu Geek]