$ sudo apt-get update
$ sudo apt-get install kdesdk-thumbnailers 

kdesdk-thumbnailers is installed in your system.

Make ensure the kdesdk-thumbnailers package were installed using the commands given below,

$ sudo dpkg-query -l | grep kdesdk-thumbnailers *

You will get with kdesdk-thumbnailers package name, version, architecture and description in a table

kdesdk-thumbnailers package basic information: