Re: I don't have root user password, Need an mp3 player..
To do things as root you must use 'sudo'. https://help.ubuntu.com/community/RootSudo
MP3 codec is found in the package, 'ubuntu-restricted-extras' along with 'flashplayer' and more.
You can install it from Terminal with:
... you will be asked for a password, type in your user password. You can't see it as you type... just type it and hit 'enter'.
sudo apt-get install ubuntu-restricted-extras
"Evolution is Nature's way of issuing upgrades."