$ sudo apt-get update
$ sudo apt-get install eclipse-mylyn-tasks-github 

eclipse-mylyn-tasks-github is installed in your system.

Make ensure the eclipse-mylyn-tasks-github package were installed using the commands given below,

$ sudo dpkg-query -l | grep eclipse-mylyn-tasks-github *

You will get with eclipse-mylyn-tasks-github package name, version, architecture and description in a table

eclipse-mylyn-tasks-github package basic information: