$ sudo apt-get update
$ sudo apt-get install libxml2-dbg 

libxml2-dbg is installed in your system.

Make ensure the libxml2-dbg package were installed using the commands given below,

$ sudo dpkg-query -l | grep libxml2-dbg *

You will get with libxml2-dbg package name, version, architecture and description in a table

libxml2-dbg package basic information: