As I said in the previous thread, Ubuntu plays mp3 out of the box but if you use xmms. If you wanna use amarok you’ll find that it’s not capable of playing mp3 files. To do so, follow the link:
Although, the article is intended for Dapper Drake, it does the same effect on Edgy Eft. Summing up you only have to install these both packages:
sudo apt-get install gstreamer0.10-plugins-ugly libxine-extracodecs
Happy listening with amarok, an awesome audio media player!!