$ sudo apt-get update
$ sudo apt-get install libvncserver-config 

libvncserver-config is installed in your system.

Make ensure the libvncserver-config package were installed using the commands given below,

$ sudo dpkg-query -l | grep libvncserver-config *

You will get with libvncserver-config package name, version, architecture and description in a table

libvncserver-config package basic information: