The Sevenmachines Adobe Flash Player 64bit PPA for Ubuntu has just been updated with the latest Adobe Flash Player "Square" 10.2.161.22 (64bit obviously) for Ubuntu 9.10, 10.04 and 10.10 so now it's even easier to install it!
Important: Adobe Flash Player "Square" is a development preview version! Use at your own risk.
To install Adobe Flash Player "Square" 10.2.161.22 in Ubuntu, run the following commands in a terminal:
sudo add-apt-repository ppa:sevenmachines/flash sudo apt-get update sudo apt-get install flashplugin64-installer