No tray icons after upgrade to Ubuntu 17.10?

Too Long; Didn't Read

I have been hearing about a lot of problems from people not being able to access the tray icons of some of their apps/background processes on Ubuntu after they upgraded to the recent Ubuntu 17.10, that uses GNOME as its default desktop environment. Well, the first fix is to just choose Unity while logging in or if you still prefer the new GNOME UI, like me, you might have to do a little bit of work to make it happen. Not a lot of it, I promise.