Icingaweb2 Setup Stuck at "Requirements"-Tab

Hey,

I am currently installing an Icinga2 Satellite that has an Icingaweb2 on it.
My Icingaweb2 Setup is stuck at the requirements tab.
I cant click “Next” even if all mandatories are OK.

The Buttons “Back” or “Refresh” are working without problem.

For those who dont know which Page i mean:

Im running Ubuntu 18.04 LTS Server with PHP 7.1

Any Ideas?

greetings
Fabian