$ sudo apt-get update
$ sudo apt-get install quicktime-x11utils 

quicktime-x11utils is installed in your system.

Make ensure the quicktime-x11utils package were installed using the commands given below,

$ sudo dpkg-query -l | grep quicktime-x11utils *

You will get with quicktime-x11utils package name, version, architecture and description in a table

quicktime-x11utils package basic information: