First off, we apologise for not coming back to you sooner but the itch notification got lost in the crowd.
Thank you for bringing this issue to our attention.
Since we have shifted to a more generic system for packaging (Effing package management: https://github.com/jordansissel/fpm ), it is possible that there are some structural differences, although we did not experience such problems, at least in some later versions of Ubuntu, Debian, Fedora, CentOS, SUSE and Red Hat. It could also be something that arose in our last releases, so we will definitely have a look at it and consider your helpful instructions :)
In the meanwhile, could you provide us with some more information about the Linux distribution that you are using?
Regarding the installation, here is a direct link to the documentation: https://www.sceelix.com/documentation/installation/
We did not package the mono dependencies in the deb package - so a separate installation is, in fact, required.