Public bug reported:

Nothing happens when clicking 'Sound Settings...' in the indicator
applet on a fresh install of Lubuntu 17.04.

This is probably because of the following code in src/sound-service-
dbus.c:

static void
show_sound_settings_dialog (DbusmenuMenuitem *mi,
                            gpointer user_data)
{
  GError * error = NULL;
  if (!g_spawn_command_line_async("gnome-volume-control --page=applications", 
&error) &&
      !g_spawn_command_line_async("gnome-control-center sound", &error) && 
      !g_spawn_command_line_async("xfce4-mixer", &error))
  {
    g_warning("Unable to show dialog: %s", error->message);
    g_error_free(error);
  }
}

and the fact that none of the above is installed (or available) by
default.

I 'fixed' the issue by creating a symbolic link xfce4-mixer ->
pavucontrol. Maybe pavucontrol should be tried in the above code as well
since that seems to be the default in Lubuntu?

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: indicator-sound-gtk2 12.10.0.1-0ubuntu5
ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
Uname: Linux 4.10.0-19-generic x86_64
ApportVersion: 2.20.4-0ubuntu4
Architecture: amd64
CurrentDesktop: LXDE
Date: Sun Apr 23 11:20:46 2017
InstallationDate: Installed on 2017-04-14 (9 days ago)
InstallationMedia: Lubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
SourcePackage: indicator-sound-gtk2
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: indicator-sound-gtk2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug zesty

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https://bugs.launchpad.net/bugs/1685598

Title:
  Clicking 'Sound Settings' in Lubuntu is a no-op

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