$ sudo apt-get update
$ sudo apt-get install eclipse-mylyn-context-cdt 

eclipse-mylyn-context-cdt is installed in your system.

Make ensure the eclipse-mylyn-context-cdt package were installed using the commands given below,

$ sudo dpkg-query -l | grep eclipse-mylyn-context-cdt *

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

eclipse-mylyn-context-cdt package basic information: