Since showeq requires qt3 libraries, here is how to get them for ubuntu 16.04.

Add this to your sources.list

deb http://archive.ubuntu.com/ubuntu/ precise main restricted multiverse universe
and then

sudo apt-get update
sudo apt-get install qt3-dev-tools
That's it. Once you're done installing, remove the repo via Software & Updates, Other Software. Find precise repo and delete it.