Debug Kit, one of the most awesome plugins for CakePHP, is now installed by default with the cake core.
However, I recently setup a brand new Cake 3 app, and DebugKit was nowhere to be seen in my app.
Checking all the usual suspects, like making sure debug is true and the plugin is loaded in app/config/bootstrap.php
I resorted to checking out the CakePHP error log file (app/tmp/logs/error.log)… And lookly-look what we have there:
Well, it just happens that not only my Cake install was fresh, but also my Ubuntu.
For me running:
.. fixed the problem.
But there are more stubborn cases and the solution for those is described here.