Flash Player 10 for 64-bit Linux (Ubuntu)

Now that there is a java browser plugin and a working wine for 64-bit on the Ubuntu repositories, there is not much holding back 64-bit Linux on the desktop. Maybe the only thing missing is the Adobe Flash player. Most of the time Flash is just annoying, nevertheless sometimes needed. Luckily, there is now a Flash Player release for 64-bit Linux (however, still beta alpha but stable so far) . I am pretty sure the instructions are identical for other Linux distributions.

To install it:

1. Download it from here.

2. Unpackage it using a terminal (with the assumption your firefox downloads into your Desktop as default):
cd Desktop
tar xvzf libflashplayer-10.0.32.18.linux-x86_64.so.tar.gz

(The name of the tar.gz file may change when a new version is released, change accordingly).

3. Create a plugin directory in your $HOME (instead of a system directory):

cd
mkdir -p .mozilla/plugins

4. Move the file to the plugin directory:
mv Desktop/libflashplayer.so .mozilla/plugins

5. Restart firefox. Go to about:plugins to see if it’s enabled:

That’s it.

Edit: Alternatively, you can use the graphical approach:

1. go to the download pages and click on “Download 64-bit Plugin for Linux (TAR.GZ, 3.64 MB)”.
2. select “Open with ” in firefox (you have to click on open to enable the ok button) and clck on OK.
3. The archive manager will open and show you the libflashplayer.so file.
4. Click on extra and a save window will open.
5. Type ctrl + h to show hidden files. Go to .mozilla (dubble click).
6. If no “plugins” directory is present, click on “Create Folder” on the top right and type as name “plugins” (without the quotes). Press Ener.
7. Click on Extract.
8. Click on Close on the windows showing the result.
9. Close the archive manager.
10. Restart firefox.

Original Source: http://nxadm.wordpress.com/2009/04/26/install-64-bit-adobe-flash-player-on-ubuntu-904/