Where is the Qt Maintenance Tool?

Install Qt development packages qt5-default qtdeclarative5-dev through apt-get.

I found the maintenance tool binary for my installation at /opt/Qt5.7.0/MaintenanceTool on Ubuntu 14.04.

I found it by using the locate tool:

sudo apt-get install mlocate
sudo updatedb
locate -i maintenance | grep -i qt

Anyways, using the maintenance tool with the apt provided package was a rabbit hole with other problems. I ended up installing a fresh version of QtCreator from the universal linux binary install provided at qt.io installing into $HOME/Qt. Uses of that maintenance tool actually do work and I can upgrade Qt Versions easily.