I am using Writer it reports: "No dictionary available"

The above question was posted last December by another person, and received only one very unhelpful reply, challenging his intelligence and offering no suggestion to actually solve the problem. I have the same problem: dictionaries are checked as present in Tools>Options>Language Settings>Writing Aids, but the spell check refuses to see them, saying “No dictionary available.” Don’t call me stupid, tell me what to do.
Edit: I found the answer myself: the line “HUNSPELL SPELLCHECKER” was not ticked. I don’t know who or what Hunspell is, have never seen it mentioned in Help, but “Spellchecker” was worth a shot in the dark, and that did it. I think of a Hun as a German, but what do I know?