Today I have reinstalled ubuntu linux in my laptop. After installation I tried to play mp3 files using Rhythmbox and I got this error message “Rhythmbox requires to install plugins to play media files of the following type: MPEG-1 Layer 3 (MP3) decoder”. It means there is no suitable mp3 decoder available to decode the mp3 files to play.
So I have installed the following package, which contains few additional packages which supports mp3 decode and playback, microsoft fonts, gstream plugins, icedtea plugin, unrar.
or you can go to this page https://apps.ubuntu.com/cat/applications/ubuntu-restricted-extras/ to get the package.
or Click the below to install ubuntu-restricted-extras