$ sudo apt-get update
$ sudo apt-get install libksignalplotter4 

libksignalplotter4 is installed in your system.

Make ensure the libksignalplotter4 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libksignalplotter4 *

You will get with libksignalplotter4 package name, version, architecture and description in a table

libksignalplotter4 package basic information: