$ sudo apt-get update
$ sudo apt-get install libkmediaplayer4 

libkmediaplayer4 is installed in your system.

Make ensure the libkmediaplayer4 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libkmediaplayer4 *

You will get with libkmediaplayer4 package name, version, architecture and description in a table

libkmediaplayer4 package basic information: