$ sudo apt-get update
$ sudo apt-get install kde-thumbnailer-deb 

kde-thumbnailer-deb is installed in your system.

Make ensure the kde-thumbnailer-deb package were installed using the commands given below,

$ sudo dpkg-query -l | grep kde-thumbnailer-deb *

You will get with kde-thumbnailer-deb package name, version, architecture and description in a table

kde-thumbnailer-deb package basic information: