Comment 3 for bug 616028

The default .bashrc should also have a comment added stating that the user has to install libnotify-bin, which is not installed by default in Maverick, to get the notify-send binary; otherwise the pop-up notification won't work.

Having libnotify-bin in the default install would take care of it too, but notify-send doesn't seem to be looked upon too highly by the folks in charge of notifications in Ubuntu anyway.