Install libghc-hopenpgp-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-hopenpgp-doc
Description:
implementation of OpenPGP (RFC4880); documentation
This is a native Haskell implementation of OpenPGP (RFC4880), including message format serialization and some cryptographic operations. . This package contains the documentation files.
Homepage: http://floss.scru.org/hOpenPGP/
Version: 2.5.5-3build12
Section: universe/doc