kompare software package provides file difference viewer, you can install in your Ubuntu 12.04 LTS (Precise Pangolin) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install kompare
kompare is installed in your system.
Make ensure the kompare package were installed using the commands given below,
$ sudo dpkg-query -l | grep kompare *
You will get with kompare package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Development |
| Package | kompare |
| Version | 4:4.8.2-0ubuntu3 |
| Description | file difference viewer |
| Sub Section | devel |