Te dejo esto, no se como estas en ingles?
Pero si necesitas traduccion te puedo hacer una sintesis rapida.
To install the Plug-in Player for Linux:
Flash Player 6 for Linux requires at a minimum glibc 2.2.x.
- This installer is script-based and cannot be run from a GUI.
- Uncompress
install_flash_player_6_linux.tar.gz. A directory called install_flash_player_6_linux is created. Navigate to this directory.
- From the command line, type ./flashplayer-installer to run the installer. The installer will instruct you to shut down your browser(s).
- Once the installation is complete, the plug-in will be installed in your Mozilla browser. To verify, choose Help > About Plug-ins from the browser's menu.