$ sudo apt-get update
$ sudo apt-get install libdebconfclient0-udeb 

libdebconfclient0-udeb is installed in your system.

Make ensure the libdebconfclient0-udeb package were installed using the commands given below,

$ sudo dpkg-query -l | grep libdebconfclient0-udeb *

You will get with libdebconfclient0-udeb package name, version, architecture and description in a table

libdebconfclient0-udeb package basic information: