rail software package provides Replace Agent-string Internal Library, 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 rail
rail is installed in your system.
Make ensure the rail package were installed using the commands given below,
$ sudo dpkg-query -l | grep rail *
You will get with rail package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Lisp |
| Package | rail |
| Version | 1.2.11-2 |
| Description | Replace Agent-string Internal Library |
| Sub Section | Lisp |