etc1tool software package provides ETC1 conversion tool, 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 etc1tool
etc1tool is installed in your system.
Make ensure the etc1tool package were installed using the commands given below,
$ sudo dpkg-query -l | grep etc1tool *
You will get with etc1tool package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Development |
| Package | etc1tool |
| Version | 6.0.1+r16-1 |
| Description | ETC1 conversion tool |
| Sub Section | Devel |