$ sudo apt-get update
$ sudo apt-get install kexec-tools-udeb 

kexec-tools-udeb is installed in your system.

Make ensure the kexec-tools-udeb package were installed using the commands given below,

$ sudo dpkg-query -l | grep kexec-tools-udeb *

You will get with kexec-tools-udeb package name, version, architecture and description in a table

kexec-tools-udeb package basic information: