I had the same problem in 2 systems running Lucid. However, I found a fix here that says K3B doesn't play the sounds because they are .wav files but if you use .ogg file the sound plays completely and it worked for me!!
http://forums.opensuse.org/english/information-new-users/unreviewed-how- faq/442106-how-fix-k3b-not-playing-notification-sounds.html -- Notifications in k3b don't play completely https://bugs.launchpad.net/bugs/482736 You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to k3b in ubuntu. -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs