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

keurocalc-data is installed in your system.

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

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

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

keurocalc-data package basic information: