Looks like there's a few parts to this one:
1. To enable all the controls on the gnome-sound-properties page, the
freedesktop sound theme (from comment 7) needs to be installed to
/usr/share/sounds
2. The instructions in this mailing list post
(https://tango.0pointer.de/pipermail/libcanberra-discuss/2008-July/000021.html)
need to be followed to enable libcanberra gtk integration. Quoted here:
"...Packagers!
If you package libcanberra, make sure to include a script like this
one in your package:
<snip>
#!/bin/sh
if [ -z "$GTK_MODULES" ] ; then
GTK_MODULES="libcanberra-gtk-module"
else
GTK_MODULES="$GTK_MODULES:libcanberra-gtk-module"
fi
export GTK_MODULES
</snip>
This script should be sourced in each Gnome session and will enable
the libcanberra gtk module for all gtk programs.
In fedora we install it as "libcanberra-gtk-module.sh" in
/etc/X11/xinit/xinitrc.d/. I assume other distributions have similar
directories.
..."
I think this second part is missing from the ubuntu libcanberra
packages, which is preventing the system sounds from working properly
even when the freedesktop theme is installed.
--
gnome-sound-properties cannot set sound preferences
https://bugs.launchpad.net/bugs/258703
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