avidemux software package provides a free video editor - GTK version, 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 avidemux
avidemux is installed in your system.
Make ensure the avidemux package were installed using the commands given below,
$ sudo dpkg-query -l | grep avidemux *
You will get with avidemux package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Graphics |
| Package | avidemux |
| Version | 1:2.5.4-0ubuntu14 |
| Description | a free video editor - GTK version |
| Sub Section | Graphics |