psi4 software package provides Quantum Chemical Program Suite, 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 psi4
psi4 is installed in your system.
Make ensure the psi4 package were installed using the commands given below,
$ sudo dpkg-query -l | grep psi4 *
You will get with psi4 package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Science |
| Package | psi4 |
| Version | 4.0~beta5+dfsg-2 |
| Description | Quantum Chemical Program Suite |
| Sub Section | Science |