I had the reverse, only the gtk3 version was installed and firefox was complaining when started from an xterm. Using your description in reverse, 'apt-get install libcanberra-gtk0' made that error go away.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/872172 Title: libcanberra-gtk0 should recommend Gtk2 and Gtk3 module to fix: Gtk- Message: Failed to load module "canberra-gtk-module" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libcanberra/+bug/872172/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
