Installing Flash on Ubuntu

About Flash
Flash 9 was released by Adobe in mid-January of 2007. By using this tutorial to install Flash, you're agreeing to this End User License Agreement from Adobe.

If you have Ubuntu AMD64
Flash doesn't natively work on the Ubuntu 64-bit edition. There is a workaround, though:
Howto Install 32 bit Firefox with Flash w/sound and Java for AMD64

If you're not using Firefox
The standard plugin folder in Ubuntu is for Firefox. If you're using Opera or Konqueror, you may have to scan for plugins or specify the proper plugins folder.

If you're installing Flash between January and April 2008
There is a bug with the usual installation method, so you should do a manual installation of Flash instead of following the tutorial outlined below.

If you're using Ubuntu 7.04 or earlier
The page you're looking at now assumes you're using Ubuntu 7.10. If you're using 7.04 or earlier, check out this guide instead.

Installing Flash
First, enable extra repositories. It's very important you do this first step; otherwise, you'll just be told later that Ubuntu can't find Flash non-free.

Second, visit a website that requires Flash.

For this example, I visited the Rhode Island School of Design homepage. Click the Install Missing Plugins button.

You'll then be prompted to install Flash or Gnash. Install Flash. Gnash's functionality is spotty at best.

You'll be asked if you want to install flashplugin-nonfree. Say Yes.

Wait for it to download the file.

Wait for the file to install.

When the installation's complete, click Close

It'll say you have to restart Firefox in order to use Flash. I didn't have to restart (Flash was available immediately), but it's possible you may have to. In either case, click Finish.

Now, Flash should be working!