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