switching from Texlive 2015 to Texlive 2016

I am running TeXLive 2015 on 16.04 (32 bit), installed manually, according to the instructions at

https://www.tug.org/texlive/quickinstall.html

I have been trying to upgrade to TeXLive 2016. I understand I can proceed as before, resulting in the directory /usr/local/texlive/2016, etc., but I would like to install via apt instead.

The issue is: when I finish apt-get installing texlive-full (using the jonathonf ppa repository) I do not know how to get Ubuntu to switch to running pdflatex through 2016 instead of the old 2015.

The command tex -v still returns Tex Live 2015.