$ sudo apt-get update
$ sudo apt-get install libqca2-plugin-gnupg 

libqca2-plugin-gnupg is installed in your system.

Make ensure the libqca2-plugin-gnupg package were installed using the commands given below,

$ sudo dpkg-query -l | grep libqca2-plugin-gnupg *

You will get with libqca2-plugin-gnupg package name, version, architecture and description in a table

libqca2-plugin-gnupg package basic information: