Sounds like an issue with an incompatiblee png library.
Regnum needs version 12, newer ubuntu shipts version 16 afaik, im not sure. See if you can install package libpng12-0 via apt or some package-manager with gui. Report back, if it doesn't work that way you could manually place the correct libraries next to the rolauncher and game executables.
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Fix the Marksman subclass: Suggestion
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