$ sudo apt-get update
$ sudo apt-get install qlandkartegt-garmin 

qlandkartegt-garmin is installed in your system.

Make ensure the qlandkartegt-garmin package were installed using the commands given below,

$ sudo dpkg-query -l | grep qlandkartegt-garmin *

You will get with qlandkartegt-garmin package name, version, architecture and description in a table

qlandkartegt-garmin package basic information: