$ sudo apt-get update
$ sudo apt-get install ltsp-client-builder 

ltsp-client-builder is installed in your system.

Make ensure the ltsp-client-builder package were installed using the commands given below,

$ sudo dpkg-query -l | grep ltsp-client-builder *

You will get with ltsp-client-builder package name, version, architecture and description in a table

ltsp-client-builder package basic information: