Indicator-sound will try first "gnome-control-center sound", then "xfce4-mixer", etc. It only opens a gnome-specific app because you've installed it. Anyway, it's probably a bug for indicator-sound, not xfce4 -indicator-plugin.
** No longer affects: xubuntu-desktop ** Changed in: xfce4-indicator-plugin (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/890262 Title: indicator-sound in xfce4-indicator-plugin option "Sound configuration" opens gnome specific app To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xfce4-indicator-plugin/+bug/890262/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs