Many problems on this website create the appearance that something is missing from Ubuntu and that a remedy might involve
sudo apt install. Unfortunately many posted solutions do not have references. For example is the following.
askubuntu has a web page for the following problem.
Gtk-Message: Failed to load module "canberra-gtk-module"
The answer with the most up-votes has 389 up-votes. askubuntu.com link
The solution with the most up-votes does not seek to install using the same string that is cited in the error message. In other words the answer is not
sudo apt install canberra-gtk-module. The solution with the most up-votes is somewhat similar to that but not exactly. Since it is not exactly that, ideally the correct answer or the most up-voted answer should have a reference to a canonical source.
How can I independently verify via referencing canonical sources that the most up-voted answer is the correct answer?