$ sudo apt-get update
$ sudo apt-get install libkfontinstui5 

libkfontinstui5 is installed in your system.

Make ensure the libkfontinstui5 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libkfontinstui5 *

You will get with libkfontinstui5 package name, version, architecture and description in a table

libkfontinstui5 package basic information: