Пока цитата из третього источника, но: https://wiki.ubuntu.com/ArtfulAardvark/Beta2/Kubuntu
Cantata Qt5 music player replaces the unmaintained KDE4 based Amarok as our default for this beta. Please test this change. This is a Music Player Daemon frontend, so configuration & usage may be unfamiliar. Most users will want to select the 'basic single user setup' in the first run wizard.
То есть Qt4 не поддерживается, а Qt5 еще не готова? Будет ди вообще готова?