matita software package provides interactive theorem prover, 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 matita
matita is installed in your system.
Make ensure the matita package were installed using the commands given below,
$ sudo dpkg-query -l | grep matita *
You will get with matita package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Mathematics |
| Package | matita |
| Version | 0.99.1-3 |
| Description | interactive theorem prover |
| Sub Section | math |