Try right-click on desktop/link to application/usr/bin and look in there.
That's the way i do it in Kubuntu and i guess it's similar for Ubuntu.
Also, to add to the menu (again in Kubuntu) right click the start menu and use the menu editor.
Have you also tried going here:-
http://www.mrbass.org/linux/ubuntu/
download and run the .zip. This (amongst other things) will install Acrobat Reader.