Install libghc-idna-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-idna-doc
Description:
Implements IDNA (RFC 3490); documentation
This package implements the Internationalized Domain Names in Applications (RFC 3490) encoding. . This package provides the documentation for a library for the Haskell programming language. See http://www.haskell.org/ for more information on Haskell.
Homepage: http://hackage.haskell.org/package/idna
Version: 0.3.0-6build4
Section: universe/doc