pdksh software package provides transitional dummy package to migrate from pdksh to mksh, 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 pdksh
pdksh is installed in your system.
Make ensure the pdksh package were installed using the commands given below,
$ sudo dpkg-query -l | grep pdksh *
You will get with pdksh package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Shells |
| Package | pdksh |
| Version | 46-2ubuntu3 |
| Description | transitional dummy package to migrate from pdksh to mksh |
| Sub Section | Shells |