gifsicle software package provides Tool for manipulating GIF images, you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gifsicle
gifsicle is installed in your system.
Make ensure the gifsicle package were installed using the commands given below,
$ sudo dpkg-query -l | grep gifsicle *
You will get with gifsicle package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Graphics |
| Package | gifsicle |
| Version | 1.88-1 |
| Description | Tool for manipulating GIF images |
| Sub Section | Graphics |