$ sudo apt-get update
$ sudo apt-get install libdecodeqr0 

libdecodeqr0 is installed in your system.

Make ensure the libdecodeqr0 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libdecodeqr0 *

You will get with libdecodeqr0 package name, version, architecture and description in a table

libdecodeqr0 package basic information: