$ sudo apt-get update
$ sudo apt-get install libgmtk1-data 

libgmtk1-data is installed in your system.

Make ensure the libgmtk1-data package were installed using the commands given below,

$ sudo dpkg-query -l | grep libgmtk1-data *

You will get with libgmtk1-data package name, version, architecture and description in a table

libgmtk1-data package basic information: