Install libghc-hdbc-postgresql-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-hdbc-postgresql-doc
Description:
PostgreSQL HDBC (Haskell Database Connectivity) documentation
HDBC provides an abstraction layer between Haskell programs and SQL relational databases. This lets you write database code once, in Haskell, and have it work with any number of backend SQL databases.
Homepage: http://hackage.haskell.org/package/HDBC-postgresql
Version: 2.3.2.4-3build4
Section: universe/doc