pymol software package provides Molecular Graphics System, 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 pymol
pymol is installed in your system.
Make ensure the pymol package were installed using the commands given below,
$ sudo dpkg-query -l | grep pymol *
You will get with pymol package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Science |
| Package | pymol |
| Version | 1.7.0.0-1 |
| Description | Molecular Graphics System |
| Sub Section | Science |