Easy support flash, mp3, java, etc on KUbuntu
Just install kubuntu-restricted-extras from the multiverse repository.
Copy & paste from the package description:
This package depends on some commonly used packages in the Kubuntu multiverse repository.
Installing this package will pull in support for MP3 playback and decoding, Java runtime environment, Flash plugin, DVD playback, and LAME (to create compressed audio files).
It will save you a lot of time and headaches.