The 2018.04 linux installer still linked against libwrap0.so which isn't necessary anymore. Since this library (TCP wrappers) is very outdated it has been removed from some distributions completely. For 2020 we should ensure we don't link against it accidentially through some third party library.
Ok, I just re-checked: Ubuntu 20.04 still has librwrap installed , so installer works. For Fedora there is no workaround , so either
- we accept the installers are not working there and document this as a know issus
- we also provide installers build on Fedora (has to be tested but should be feasible)
- we fix this bug