This question already has an answer here:
I found a page (Log out of the site) that answers the question on how to logout of Ask Ubuntu, so I have the link (https://askubuntu.com/users/logout) which I can bookmark and use that every time I want to logout, but that seems awkward. Isn't there a link/button in either the regular questions/answers pages or in my account/profile pages? I've been looking hard for a while but can't find it.
Right now I'm logged in to "Ask Ubuntu" but NOT StackExchange, so the logout option from the StackExchange logo does not appear, that's normal.
I'm on Firefox, up-to-date.