Amarok uses update-notifier-kde to prompt for restricted codecs install. Most non-Kubuntu desktop users won't have that installed and won't get prompted, which is indeed a regression from previously.
Ideally Amarok would use packagekit to check for useful codecs and install through that. This would be a (mostly) desktop and distro independent way of installing codecs.
Amarok uses update-notifier-kde to prompt for restricted codecs install. Most non-Kubuntu desktop users won't have that installed and won't get prompted, which is indeed a regression from previously.
Ideally Amarok would use packagekit to check for useful codecs and install through that. This would be a (mostly) desktop and distro independent way of installing codecs.