latex209-src software package provides source files of macros of LaTeX 2.09 25-mar-1992 version, 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 latex209-src
latex209-src is installed in your system.
Make ensure the latex209-src package were installed using the commands given below,
$ sudo dpkg-query -l | grep latex209-src *
You will get with latex209-src package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | TeX |
| Package | latex209-src |
| Version | 25.mar.1992-15 |
| Description | source files of macros of LaTeX 2.09 25-mar-1992 version |
| Sub Section | TeX |