$ sudo apt-get update
$ sudo apt-get install fonts-fantasque-sans 

fonts-fantasque-sans is installed in your system.

Make ensure the fonts-fantasque-sans package were installed using the commands given below,

$ sudo dpkg-query -l | grep fonts-fantasque-sans *

You will get with fonts-fantasque-sans package name, version, architecture and description in a table

fonts-fantasque-sans package basic information: