$ sudo apt-get update
$ sudo apt-get install libreoffice-templates 

libreoffice-templates is installed in your system.

Make ensure the libreoffice-templates package were installed using the commands given below,

$ sudo dpkg-query -l | grep libreoffice-templates *

You will get with libreoffice-templates package name, version, architecture and description in a table

libreoffice-templates package basic information: