lyx-common software package provides architecture-independent files for LyX, 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 lyx-common
lyx-common is installed in your system.
Make ensure the lyx-common package were installed using the commands given below,
$ sudo dpkg-query -l | grep lyx-common *
You will get with lyx-common package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Editors |
| Package | lyx-common |
| Version | 2.0.6-1build1 |
| Description | architecture-independent files for LyX |
| Sub Section | Editors |