“Ripping” is the process of taking a CD and copying tracks from it onto your computer or portable music player. CD ripping is sometimes called ‘CD extraction’.
First, install encoders:
$ sudo apt-get install ubuntu-restricted-extras lame
Then, install KaudioCreator
$ sudo apt-get install kaudiocreator
Launch KaudioCreator (Kmenu->Multimedia->KaudioCreator). It should automatically display the tracks in the disc. You can modify the settings to suit your needs (Settings->Configure KaudioCreator), and also choose an encoder (MP3). Click on the Rip Selection icon to start the Ripping and encoding process.