回答:
最近のバージョンでは、gsettingキーをリセットするためにこれをしなければなりませんでした(ありませんでした~/.gconf/apps/rhythmbox
)
gsettings reset-recursively org.gnome.rhythmbox
gsettings reset-recursively org.gnome.rhythmbox.display-page-tree
gsettings reset-recursively org.gnome.rhythmbox.library
gsettings reset-recursively org.gnome.rhythmbox.player
gsettings reset-recursively org.gnome.rhythmbox.plugins
gsettings reset-recursively org.gnome.rhythmbox.plugins.iradio
gsettings reset-recursively org.gnome.rhythmbox.plugins.lyrics
gsettings reset-recursively org.gnome.rhythmbox.plugins.magnatune
gsettings reset-recursively org.gnome.rhythmbox.plugins.replaygain
gsettings reset-recursively org.gnome.rhythmbox.plugins.visualizer
gsettings reset-recursively org.gnome.rhythmbox.podcast
gsettings reset-recursively org.gnome.rhythmbox.podcast
gsettings reset-recursively org.gnome.rhythmbox.rhythmdb
gsettings reset-recursively org.gnome.rhythmbox.sharing
gsettings reset-recursively org.gnome.rhythmbox.sources