$ sudo apt-get update
$ sudo apt-get install ptex-buildsupport 

ptex-buildsupport is installed in your system.

Make ensure the ptex-buildsupport package were installed using the commands given below,

$ sudo dpkg-query -l | grep ptex-buildsupport *

You will get with ptex-buildsupport package name, version, architecture and description in a table

ptex-buildsupport package basic information: