luatex software package provides next generation TeX engine, 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 luatex
luatex is installed in your system.
Make ensure the luatex package were installed using the commands given below,
$ sudo dpkg-query -l | grep luatex *
You will get with luatex package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | TeX |
| Package | luatex |
| Version | 0.76.0-3ubuntu1 |
| Description | next generation TeX engine |
| Sub Section | TeX |