You may have seen this message when executing a GTK+ application from the
terminal:
Gtk-Message: Failed to load module "canberra-gtk-module"
And/or this one:
WARNING **: Couldn't register with accessibility bus: Did not receive a
reply. Possible causes include: the remote application did not send a reply,
the message bus security policy blocked the reply, the reply timeout expired,
or the network connection was broken.
To get rid of the first message, install "libcamberra-gtk-module", in
Trisquel's repository.
To get rid of the second message, execute that command:
$ echo 'export NO_AT_BRIDGE=1' | sudo tee -a /etc/environment