I found some tutorials in Google Search about installing new sound theme for Ubuntu, I made a copy sound theme (folder) into
/usr/share/sounds. It was easy to copy with commands but I cannot choose new sound theme in System Settings → Sound. I've used
gconf-editor to enter new sound theme manually in desktop → gnome → sound, with No success.
What's the problem with this way? Anyone who succeeded in changing into a new sound theme on Ubuntu 11.10, please let me know.