Beginner's installation problem in linux

[routeconverter]

Yes indeed.  Ubuntu currently installs with something called 'Ubuntu Software' - which is basically analogous to 'Google Play' on Android phones etc.
If you try and install anything that isn't recognised as an 'approved'* app then all sorts of dire warnings are given - hence my question, and comments, here.

I've googled for about 10 minutes and still don't have a clue how to package RouteConverter for the Ubuntu Software Center (I guess that's what you're using?)

Frankly, that's annoying and for some 20 or 30 users that use it, definitely the worst Dev-experience you can produce as a software vendor.