Comment 7 for bug 934206

While this fix will prevent duplicates appearing, if you are just upgrading to Precise, it will not remove existing duplicates from your library. To do this, you'll need to do it manually, either by removing them from the library in rhythmbox, which can be a bit tedious, or by quitting rhythmbox, deleting the ~/.local/share/rhythmbox/rhythmdb.xml file, and starting rhythmbox again, to let it re-scan your entire music library. Of course, you'll want to make sure you have the new version of rhythmbox-ubuntuone installed first. This fix will be in the 2.99.91 release, which should be uploaded to Precise tomorrow, or will appear very shortly in ppa:ubuntuone/nightlies if you are using the nightlies PPA.