This week, in our Linux Page (in Spanish), we have written some easy instructions to repair the flash plugin on Ubuntu 9.04 Jaunty. In fact, after a brand new install on my Acer Aspire Athlon X2 I had big problems in visualizing Flash contents on Firefox 3. I tried to reinstall the plugin different times but the result did not change. Finally, reading a page in ubuntuforums.org I find the right solution for my problem. First of all you have to open Synaptic Package Manager (in System – Administration) and remove all the swfdec packages (in my case swfdec -mozilla and swfdec -gnome). Then, using the Terminal you have to type sudo apt-get install flashplugin-nonfree. Now you restart Firefox and Flash contents will be available again. We believe that this solution is really fast and practical but if you know a better one which could permit us not to install non free code please let us know. 
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Useful post, great read anyway very interesting.
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Why uninstall swfdec with synaptic and install flahsplugin deom the terminal?
You should use the method for both tasks!
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I cant believe it works !!! TNXS A LOT , i hoppe that maybe u can help me on a several differnt problems i have with my new Jackalop, like installing Adobe CS3 Studio with Wine o Virtual BOx, I really dont want to go back to linux !!
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I get the following: please help!
Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
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…wait I googled that message and got…
sudo rm /var/lib/dpkg/lock
then ran the sudo….nonfree plugin..
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Great advice !
I got this problem after a fresh Jaunty 9.04 install, all the latest updates applied.
After the below fix, CPU load when playing flash went from “100% and stuttering” down to “neglible contribution to load”.
In my case these two commands did it:
apt-get remove swfdec-mozilla
sudo apt-get install flashplugin-nonfree
it seems no need to manually fiddle with CPU scaling governors or UXA acceleration, I run the full Compiz features.
This is on a four year old HP zt3110EA Pavilion laptop,
runs beautfully thanks to Ubuntu.
Greetings from Sweden !
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