FVWM on Ubuntu 18.04 Beaver

I have installed fvwm on my latest ubuntu installation, but don’t have a clue how to get it to work. Definitely not as obvious as on 14.04

Can anyone give me some pointers please?

You should ask ubuntu support. If using a display manager there should be an fvwm session listed you can select, or add ‘exec fvwm’ to your ~/.xsession file. That is what is needed in debian at least.