$ sudo apt-get update
$ sudo apt-get install libkwalletbackend5-5 

libkwalletbackend5-5 is installed in your system.

Make ensure the libkwalletbackend5-5 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libkwalletbackend5-5 *

You will get with libkwalletbackend5-5 package name, version, architecture and description in a table

libkwalletbackend5-5 package basic information: