The same here with Linux Mint 20.1 Ulyssa base: Ubuntu 20.04 focal :
xxx@xxxx:~$ ~/regnum/rolauncher
(rolauncher:4939): GLib-CRITICAL **: 23:00:23.178: Source ID 944 was not found when attempting to remove it
./game: error while loading shared libraries: libncursesw.so.5: cannot open shared object file: No such file or directory
But i can launch it with steam on same pc....
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