Install libghc-unliftio-core-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-unliftio-core-doc
Description:
MonadUnliftIO typeclass for unlifting monads to IO; documentation
Provides the core MonadUnliftIO typeclass, instances for base and transformers, and basic utility functions. Typically, you'll want to use the unliftio library, which provides more functionality (and a much better description). . This package provides the documentation for a library for the Haskell programming language. See http://www.haskell.org/ for more information on Haskell.
Homepage: https://github.com/fpco/monad-unlift/tree/master/unliftio-core#readme
Version: 0.1.0.0-1
Section: universe/doc