pinentry-doc software package provides documentation for pinentry packages, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install pinentry-doc
pinentry-doc is installed in your system.
Make ensure the pinentry-doc package were installed using the commands given below,
$ sudo dpkg-query -l | grep pinentry-doc *
You will get with pinentry-doc package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Utilities |
| Package | pinentry-doc |
| Version | 0.8.3-1ubuntu1 |
| Description | documentation for pinentry packages |
| Sub Section | Utils |