Looks like Canonical has once again removed something from Ubuntu without any kind of documentation (I searched high and low), who knows why or where it went, or if and when it will be back?
When I upgraded From Linux Studio 16.04 to 16.10, I got what I thought was the newest version of LO, but the quick starter and the option to install it just vanished. If this happens to you, either live with it, or install the most recent LibreOffice “Fresh” PPA to always have the newest stable version of LibreOffice, and some additions to it, even if canonical has not approved of it yet and added it to the Ubuntu repositories. You need to tell APT to install libreoffice-systray, it does not install by default with LO.
In the few Years I have been Using LibreOffice on Ubuntu, I have had to wait for new features others were already using for months, and have come across many problems I was told to fix this way, but was always afraid to do it because Canonical does not approve of the method. Now I will see if there really is anything to worry about, in always updating to the most recent and cutting edge LO. :>)